Barco DP2K-20CLP User guide

DP2K CLP series
Safety manual
R5906714/01
09/05/2016

Barco NV
President Kennedypark 35, 8500 Kortrijk, Belgium
Phone: [phone]
Fax: [phone]
Support: www.barco.com/en/support
Visit us at the web: www.barco.com
Printed in Belgium

1. Safety
1. SAFETY
About this chapter
Read this chapter attentively. It contains important information to prevent personal injury while installing and using your DP2K-
CLP series projector. Furthermore, it includes several cautions to prevent damage to your DP2K-CLP series projector. Ensure that
you understand and follow all safety guidelines, safety instructions and warnings mentioned in this chapter before installing and
using the DP2K-CLP series projector. After this chapter, additional “warnings” and “cautions” are given depending on the procedure.
Read and follow these “warnings” and “cautions” as well.
Clarification of the term “DP2K-CLP series” used in this document
When referring in this document to the term “DP2K-CLP series” means that the content is applicable for following Barco products:
• DP2K-15CLP
• DP2K-20CLP
Barco provides a guarantee relating to perfect manufacturing as part of the legally stipulated terms of guar-
antee. Observing the specification mentioned in this chapter is critical for projector performance. Neglecting
this can result in loss of warranty.
Overview
• General considerations
• Important safety instructions
• Product safety labels
• High Brightness precautions: Hazard Distance (HD)
• HD for fully enclosed projection systems
• HD in function of modifying optics
1.1 General considerations
General safety instructions
• Before operating this equipment please read this manual thoroughly and retain it for future reference.
• Installation and preliminary adjustments should be performed by qualified Barco personnel or by authorized Barco service deal-
ers.
• All warnings on the projector and in the documentation manuals should be adhered to.
• All instructions for operating and use of this equipment must be followed precisely.
• All local installation codes should be adhered to.
Notice on safety
This equipment is built in accordance with the requirements of the international safety standards IEC60950-1, EN60950-1,
UL60950-1 and CAN/CSA C22.2 No.60950-1, which are the safety standards of information technology equipment including
electrical business equipment. These safety standards impose important requirements on the use of safety critical components,
materials and insulation, in order to protect the user or operator against risk of electric shock and energy hazard and having access
to live parts. Safety standards also impose limits to the internal and external temperature rises, radiation levels, mechanical stability
and strength, enclosure construction and protection against the risk of fire. Simulated single fault condition testing ensures the
safety of the equipment to the user even when the equipment’s normal operation fails.
Notice on optical radiation
This projector embeds extremely high brightness (radiance) lasers; this laser light is processed through the projectors optical path.
Native laser light is not accessible by the end user in any use case. The light exiting the projection lens has been defused within the
optical path, representing a larger source and lower radiance value than native laser light. Nevertheless the projected light repre-
sents a significant risk for the human eye when exposed directly within the beam. This risk is not specific related to the characteristics
of laser light but solely to the high thermal induced energy of the light source; which is equivalent with lamp based systems.
Thermal retinal eye injury is possible when exposed within the Hazard Distance (HD). The HD is defined from the projection lens
surface towards the position of the projected beam where the irradiance equals the maximum permissible exposure as described in
the chapter “Hazard Distance”.
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1. Safety
WARNING:No direct exposure to the beam within the hazard distance shall be permitted, RG3 IEC 62471-
5:2015
CAUTION:Use of controls or adjustments or performance of procedures other than those specified herein
may result in hazardous radiation exposure.
Restricted access location
This product may only be installed in a restricted access location. The definition of a “restricted access location" is a location for
equipment where both of following applies:
• Access can only be gained by SERVICE PERSONNEL or by OPERATORS who have been instructed about the reasons for
the restriction applied to the location and about the precautions that shall be taken.
• Access is through the use of the tool or lock and key, or other means of security, and is controlled by the authority responsible
for the location.
Why a restricted access location: This is a RG3 product. Based on international requirements, no person in allowed to enter the
projected beam within the zone between the projection lens and the related Hazard Distance (HD). This shall be physically impossible
by creating sufficient separation height or by placing optional barriers. Within the restricted area operator training is considered
sufficient. The applicable separation heights are discussed in "High Brightness precautions: Hazard Distance (HD)", page 6 .
Restricted access location
This product may only be installed in a restricted access location. The definition of a “restricted access location" is a location for
equipment where both of following applies:
• Access can only be gained by SERVICE PERSONNEL or by OPERATORS who have been instructed about the reasons for
the restriction applied to the location and about the precautions that shall be taken.
• Access is through the use of the tool or lock and key, or other means of security, and is controlled by the authority responsible
for the location.
Why a restricted access location: This is a RG3 product. Based on international requirements, no person in allowed to enter the
projected beam within the zone between the projection lens and the related Hazard Distance (HD). This shall be physically impossible
by creating sufficient separation height or by placing optional barriers. Within the restricted area operator training is considered
sufficient. The applicable separation heights are discussed in "High Brightness precautions: Hazard Distance (HD)", page 6 .
Users definition
Throughout this manual, the terms SERVICE PERSONNEL and TRAINED PROJECTIONIST refers to persons having appropriate
technical training and experience necessary to be knowledgeable of potential hazards to which they are exposed (including, but not
limited to HIGH VOLTAGE ELECTRIC and ELECTRONIC CIRCUITRY and HIGH BRIGHTNESS PROJECTORS) in performing a
task, and of measures to minimize the potential risk to themselves or other persons. The term USER and OPERATOR refers to
any person other than SERVICE PERSONNEL or TRAINED PROJECTIONISTS, AUTHORIZED to operate professional projection
systems.
The TRAINED PROJECTIONISTS may only perform the maintenance task described in the User & Installation manual. All other
maintenance tasks and service tasks must be performed by qualified SERVICE PERSONNEL.
The DLP Cinema Systems are intended "FOR PROFESSIONAL USE ONLY" by AUTHORIZED PERSONNEL familiar with potential
hazards associated with high voltage, high intensity light beams generated by lasers. Only qualified SERVICE PERSONNEL and
TRAINED PROJECTIONISTS, knowledgeable of such risks, are allowed to perform service functions inside the product enclosure.
Owner’s record
The part number and serial number are printed on a label which is stuck on the respective part. Record these numbers in the spaces
provided below. Refer to them whenever you call upon your Barco dealer regarding this product.
Product article number
Product serial number
Dealer
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1. Safety
1.2 Important safety instructions
To prevent the risk of electrical shock
• This projector should be operated from an AC power source. Ensure that the mains voltage and capacity matches the projector
electrical ratings. If you are unable to install the AC requirements, contact your electrician. Do not defeat the purpose of the
grounding.
• Installation according to the local electrical code and regulations by qualified technical personnel only.
• This product is equipped with a three-terminal barrier strip for the connection of a mono phase line with a separate earth ground
PE. If you are unable to install the AC requirements, contact your electrician. Do not defeat the purpose of the grounding.
• The cross-sectional area of the conductors in the power supply cord shall be not less than 4 mm2or AWG 10.
• The electronics of the projector must be powered either from a suitable UPS unit or from the power outlet socket (UPS OUTLET)
provided on the projector. For that reason an adapted short power cord (2-pole 3-wire grounding) is added to the projector
accessories to loop through the power.
• The cross-sectional area of the UPS inlet cord shall be not less than 0.75 mm² or AWG 18.
• The provided power output socket (UPS OUTLET) on the projector may only be used to provide power to the projector elec-
tronics. Never connect other devices to this power output socket.
• The circuit breaker(s) that must be provided in the power circuit(s) of the projector is considered as general disconnect switch(es)
to switch off the complete installation.
• Disconnect the power to the projector mains terminals and unplug the power cord at UPS INLET for removal of all power from
the projector.
• Do not allow anything to rest on the power cord. Do not locate this projector where persons will walk on the cord.
• Do not operate the projector with a damaged cord or if the projector has been dropped or damaged - until it has been examined
and approved for operation by a qualified service technician.
• Position the cord so that it will not be tripped over, pulled, or contact hot surfaces.
• If an extension cord is necessary, a cord with a current rating at least equal to that of the projector should be used. A cord rated
for less amperage than the projector may overheat.
• Never push objects of any kind into this projector through cabinet slots as they may touch dangerous voltage points or short
circuit parts that could result in a risk of fire or electrical shock.
• Do not expose this projector to rain or moisture.
• Do not immerse or expose this projector in water or other liquids.
• Do not spill liquid of any kind on this projector.
• Should any liquid or solid object fall into the cabinet, unplug the set and have it checked by qualified service personnel before
resuming operations.
• Do not disassemble this projector, always take it to an authorized trained service person when service or repair work is required.
• Do not use an accessory attachment which is not recommended by the manufacturer.
• Lightning - For added protection for this video product during a lightning storm, or when it is left unattended and unused for
long periods of time, unplug it from the wall outlet and disconnect media and communication cables. This will prevent damage
to the projector due to lightning and AC power-line surges.
To prevent fire hazard
• Do not place flammable or combustible materials near the projector!
• Barco large screen projection products are designed and manufactured to meet the most stringent safety regulations. This
projector radiates heat on its external surfaces and from ventilation ducts during normal operation, which is both normal and
safe. Exposing flammable or combustible materials into close proximity of this projector could result in the spontaneous ignition
of that material, resulting in a fire. For this reason, it is absolutely necessary to leave an “exclusion zone” around all external
surfaces of the projector whereby no flammable or combustible materials are present. The exclusion zone must be not less
than 40 cm (16”) for all DLP Cinema projectors. The exclusion zone on the lens side must be at least 5 m. Do not cover the
projector or the lens with any material while the projector is in operation. Keep flammable and combustible materials away from
the projector at all times. Mount the projector in a well ventilated area away from sources of ignition and out of direct sun light.
Never expose the projector to rain or moisture. In the event of fire, use sand, CO2or dry powder fire extinguishers. Never use
water on an electrical fire. Always have service performed on this projector by authorized Barco service personnel. Always
insist on genuine Barco replacement parts. Never use non-Barco replacement parts as they may degrade the safety of this
projector.
• Ensure no miss alignment can occur. Prolonged long time exposure of black wooden walls at close distance (< 20cm) can
represent a fire risk. After alignment the projector shall be securely mounted to the pedestal.
• Slots and openings in this equipment are provided for ventilation. To ensure reliable operation of the projector and to protect
it from overheating, these openings must not be blocked or covered. The openings should never be blocked by placing the
projector too close to walls, or other similar surface. This projector should never be placed near or over a radiator or heat
register. This projector should not be placed in a built-in installation or enclosure unless proper ventilation is provided.
• Projection rooms must be well ventilated or cooled in order to avoid build-up of heat. It is necessary to vent hot exhaust air from
projector and cooler to the outside of the building.
• Let the projector cool completely before storing. Remove cord from the projector when storing.
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1. Safety
To prevent battery explosion
• Danger of explosion if battery is incorrectly installed.
• Replace only with the same or equivalent type recommended by the manufacturer.
• For disposal of used batteries, always consult federal, state, local and provincial hazardous waste disposal rules and regulations
to ensure proper disposal.
To prevent personal injury
• To prevent injury and physical damage, always read this manual and all labels on the system before powering the projector or
adjusting the projector.
• Do not underestimate the weight of the projector. The projector without the top cooler weights ±106 kg (±233.7 pounds). To
prevent personal injury a hoisting tool should be used to lift the projector.
• To prevent injury, ensure that the lens, cooling system and all cover plates are correctly installed. See installation procedures.
• Warning: high intensity light beam. NEVER look into the lens ! High luminance could result in damage to the eye.
•Warning: extremely high brightness projector: This projector embeds extremely high brightness (radiance) lasers; this laser
light is processed through the projectors optical path. Native laser light is not accessible by the end user in any use case. The
light exiting the projection lens has been defused within the optical path, representing a larger source and lower radiance value
than native laser light. Nevertheless the projected light represents a significant risk for the human eye when exposed directly
within the beam. This risk is not specific related to the characteristics of laser light but solely to the high thermal induced energy
of the light source; which is equivalent with lamp based systems.
Thermal retinal eye injury is possible when exposed within the Hazard Distance. The Hazard Distance (HD) is defined from
the projection lens surface towards the position of the projected beam where the irradiance equals the maximum permissible
exposure as described in the chapter "High Brightness precautions: Hazard Distance (HD)", page 6 .
• Based on international requirements, no person in allowed to enter the projected beam within the zone between the projection
lens and the related Hazard Distance (HD). This shall be physically impossible by creating sufficient separation height or by
placing optional barriers. Within the restricted area operator training is considered sufficient. The applicable separation heights
are discussed in "High Brightness precautions: Hazard Distance (HD)", page 6 .
• The projector shall be installed in a restricted access room equipped with a key or security lock preventing untrained persons
entering the Risk Group 3 use zone.
• Switch off the projector before attempting to remove any of the projector’s covers.
• When required to remove all power from the projector (eg during service), always disconnect the power from the projector
mains terminals and UPS INLET connector. Use the disconnect device in the building installation to disconnect the power to
the projector mains terminals, and unplug the power cord at the UPS INLET connector if the UPS INLET is separately powered.
• Do not place this equipment on an unstable cart, stand, or table. The product may fall, causing serious damage to it and
possible injury to the user.
• Lenses, shields or screens shall be changed if they have become visibly damaged to such an extent that their effectiveness is
impaired. For example by cracks or deep scratches.
• The associated Safety responsible of the unit must evaluate the setup before the unit may be started.
• Never point or allow light to be directed on people or reflective objects within the HD zone.
• All operators shall have received adequate training and be aware of the potential hazards.
• Strictly minimize the number of people who have access to the unit. The unit may never be operated without permission of the
responsible for safety.
• Do not put your hand or any body part in front of the beam.
Do not clean the port window when the projector is switched on.
• For a stand alone cooler, position the tubes so that they will not be tripped over, pulled, or contact hot surfaces.
On servicing
• Do not attempt to service this product yourself, as opening or removing covers may expose you to dangerous voltage potentials
and risk of electric shock.
• Refer all servicing to qualified service personnel.
• Attempts to alter the factory-set internal controls or to change other control settings not specially discussed in this manual can
lead to permanent damage to the projector and cancellation of the warranty.
• Remove all power from the projector and refer servicing to qualified service technicians under the following conditions:
- When the power cord or plug is damaged or frayed.
- If liquid has been spilled into the equipment.
- If the product has been exposed to rain or water.
- If the product does not operate normally when the operating instructions are followed. Adjust only those controls that are
covered by the operating instructions since improper adjustment of the other controls may result in damage and will often
require extensive work by a qualified technician to restore the product to normal operation.
- If the product has been dropped or the cabinet has been damaged.
- If the product exhibits a distinct change in performance, indicating a need for service.
• Replacement parts: When replacement parts are required, be sure the service technician has used original Barco replacement
parts or authorized replacement parts which have the same characteristics as the Barco original part. Unauthorized substitu-
tions may result in degraded performance and reliability, fire, electric shock or other hazards. Unauthorized substitutions may
void warranty.
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1. Safety
• Safety check: Upon completion of any service or repairs to this projector, ask the service technician to perform safety checks
to determine that the product is in proper operating condition.
To prevent projector damage
• The air filters of the projector must be cleaned or replaced on a regular basis. Cleaning the booth area would be monthly-
minimum. Neglecting this could result in disrupting the air flow inside the projector, causing overheating. Overheating may lead
to the projector shutting down during operation.
• The projector must always be installed in a manner which ensures free flow of air into its air inlets.
• If more than one projector is installed in a common projection booth, the exhaust air flow requirements are valid for EACH
individual projector system. Note that inadequate air extraction or cooling will result in decreased life expectancy of the projector
as a whole as well as causing premature failure of the lasers.
• In order to ensure that correct airflow is maintained, and that the projector complies with Electromagnetic Compatibility (EMC)
and safety requirements, it should always be operated with all of it’s covers in place.
• Slots and openings in the cabinet are provided for ventilation. To ensure reliable operation of the product and to protect it from
overheating, these openings must not be blocked or covered. The openings should never be blocked by placing the product
on a bed, sofa, rug, or other similar surface. This product should never be placed near or over a radiator or heat register. The
device should not be placed in a built-in installation or enclosure unless proper ventilation is provided.
• Ensure that nothing can be spilled on, or dropped inside the projector. If this does happen, switch off and remove all power
from the projector. Do not operate the projector again until it has been checked by qualified service personnel.
• Do not block the projector cooling fans or free air movement around the projector. Loose papers or other objects may not be
nearer to the projector than 10 cm (4") on any side.
• Proper operation of the projector can only be guaranteed in table mounting. It is not permitted to use the projector in another
position. See installation procedure for correct installation.
•Special care for Laser Beams: Special care should be used when DLP projectors are used in the same room as high power
laser equipment. Direct or indirect hitting of a laser beam on to the lens can severely damage the Digital Mirror DevicesTM in
which case there is a loss of warranty.
• Never place the projector in direct sunlight. Sunlight on the lens can severely damage the Digital Mirror DevicesTM in which
case there is a loss of warranty.
• Save the original shipping carton and packing material. They will come in handy if you ever have to ship your equipment. For
maximum protection, repack your set as it was originally packed at the factory.
• Remove all power from the projectors mains terminals before cleaning. Do not use liquid cleaners or aerosol cleaners. Use a
damp cloth for cleaning. Never use strong solvents, such as thinner or benzine or abrasive cleaners, since these will damage
the cabinet. Stubborn stains may be removed with a cloth lightly dampened with mild detergent solution.
• To ensure the highest optical performance and resolution, the projection lenses are specially treated with an anti-reflective
coating, therefore, avoid touching the lens. To remove dust on the lens, use a soft dry cloth. For lens cleaning follow the
instructions precisely as stipulated in the projector manual.
• Rated maximum ambient temperature, ta= 35°C (95°F).
• Rated humidity = 5% to 85% RH Non-condensed.
• An external frame must be used to stack projectors.
• For functionality and reliability, the projector requires accurate temperature control and cooling. Therefore a liquid cooling sys-
tem is provided consisting of liquid circuits inside the projector which are connected via hoses to external coolers. Only cooler
models and hoses exclusively developed for this application and approved by Barco are allowed to be used.
• When using the projector with a stand alone cooler, do not stand on the cooling tubes or do not place any object on the tubes
so that free liquid flow can be guaranteed. Position the tubes so that there is no contact with hot surfaces.
1.3 Product safety labels
Light beam related safety labels
Label image Label description Label location
Hazard RG3: optical radiation warning symbol
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1. Safety
Label image Label description Label location
WARNING! DO NOT LOOK INTO THE LIGHT BEAM
NO DIRECT EYE EXPOSURE TO THE BEAN IS
PERMITTED
RG3 IEC EN 62471–5:2015
CLASS 1 IEC EN 60825–1:2014
HAZARD DISTANCE: CONSULT SAFETY MANUAL
COMPLIES WITH 21 CFR 1040 EXCEPT WITH
RESPECT TO THOSE CHARACTERISTICS
AUTHORIZED BY VARIANCE NUMBER 2014-V-0285
DATED APRIL 14, 2016 RISK GROUP 3 LIP IEC
62471:2016
警告！
勿观看光束
眼睛勿直接接触可允许暴露的光束
(RG3 IEC EN 62471-5:2015 CLASS 1 IEC EN
60825-1:2014)
危害距离：请参考
安全手册
DANGER !
NE PAS REGARDER LE FAISCEAU EVITER TOUTE
EXPOSITION DIRECTE DES YEUX AU FAISCEAU
RG3 IEC EN 62471-5:2015
CLASS 1 IEC EN 60825-1:2014
DISTANCE DE SECURITE : CONSULTER LE MANUEL
DE SECURITE
Hazard RG3: not for household use symbol
1.4 High Brightness precautions: Hazard Distance (HD)
HD
Hazard Distance (HD) is the distance measured from the projection lens at which the intensity or the energy per surface
unit becomes lower than the applicable exposure limit on the cornea or on the skin. The light beam is considered (to
be) unsafe for exposure if the distance from a person to the light source is less than the HD.
Restriction Zone (RZ) based on the HD
The HD depends on the amount of lumens produced by the projector and the type of lens installed. See next chapter"HD in function
of modifying optics", page 9 .
To protect untrained end users (as cinema visitors) the installation shall comply with the following installation requirements: Oper-
ators shall control access to the beam within the hazard distance or install the product at the height that will prevent spectators’
eyes from being in the hazard distance. Radiation levels in excess of the limits will not be permitted at any point less than 2.0 (SH
image 1-1) meters above any surface upon which persons other than operators, performers, or employees are permitted to stand
or less than 1,0 (SH image 1-1) meters lateral separation from any place where such persons are permitted to be. In non-cinema
environments where unrestrained behavior is reasonably foreseeable, the minimum separation height should be greater than or
equal to 3,0 m to prevent potential exposure, for example by an individual sitting on another individual’s shoulders, within the HD.
These values are minimum values and are based on the guidance provided in IEC 62471-5:2015 section 6.6.5.
The end user must understand the risk and apply protective measures based upon the hazard distance as indicated on the label and
in the user information. Installation method, barriers, detection system or other applicable control measure shall prevent hazardous
eye access to the radiation within the hazard distance.
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For example, cinema projectors that have a HD greater than 1 m and emit light into an uncontrolled area where persons may be
present should be positioned in accordance with “the fixed projector installation” parameters, resulting in a HD that does not extend
into the audience area unless the beam is at least 2 m above the floor level. In non-cinema environments where unrestrained
behavior is reasonably foreseeable, the minimum separation height should be greater than or equal to 3,0 m to prevent potential
exposure, for example by an individual sitting on another individual’s shoulders, within the HD. For example, a sufficiently large
separation height may be achieved by mounting the image projector on the ceiling or through the use of physical barriers.
For applications installed in the USA market the above limits do not apply. The relevant minimum separation height is 2.5m (8.2 ft)
and the separation width is defined as 1.0m (3.3 ft) by the FDA CDRH.
RA
TH
PR
RZ
HD
SW
1m
SW
SW
SW
HD
SH
RA TH
RZ
SH
(B) TOP VIEW(A) SIDE VIEW
Image 1-1
ASideview.
B Top view.
RA Restricted Access location (boot area of projector).
PR Projector.
TH Theater.
RZ Restriction Zone in the theater.
SH Separation Height.
SW Separation Width.
Based on national requirements, no person is allowed to enter the projected beam within the zone between the projection lens and
the related hazard distance (HD). This shall be physically impossible by creating sufficient separation height or by placing barriers.
The minimum separation height takes into account the surface upon which persons other than operator, performers or employees
are permitted to stand.
On image 1-2 a typical setup is displayed. It must be verified if these minimum requirements are met. If required a restricted zone
(RZ) in the theater must be established. This can be done by using physical barrier, like a red rope as illustrated in image 1-2.
The restricted area sticker can be replaced by a sticker with only the symbol.
PR
RESTRICTED
AREA
RESTRICTED
AREA
Image 1-2
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1. Safety
1.5 HD for fully enclosed projection systems
HD
Hazard Distance (HD) is the distance measured from the projection lens at which the intensity or the energy per surface
unit becomes lower than the applicable exposure limit on the cornea or on the skin. The light beam is considered (to
be) unsafe for exposure if the distance from a person to the light source is less than the HD.
Restriction Zone (RZ) based on the HD
The projector is also suitable for rear projection applications; projecting a beam onto a defuse coated projection screen. As displayed
in image 1-3 two areas should be considered: the restricted enclosed projection area (RA) and the observation area (TH).
RA TH
sw
PD
HDDIFFUSE
sw
RZ
sw sw
PR
HD
REFLECTION
RESTRICTED
AREA
RESTRICTED
AREA
Image 1-3
RA Restricted Access location (enclosed projection area).
PR Projector.
TH Theater (observation area).
RZ Restriction Zone.
PD Projection Distance.
SW Separation Width. Must be minimum 1 meter.
For this type of setup 3 different HD shall be considered:
• HD as discussed in "High Brightness precautions: Hazard Distance (HD)", page 6 , relevant for intrabeam exposure.
•HD
reflection : the distance that has to be kept restrictive related to the reflected light from the rear projection screen.
•HD
diffuse : the relevant distance to be considered while observing the defuse surface of the rear projection screen.
As described in "High Brightness precautions: Hazard Distance (HD)", page 6 , it is mandatory to create a restricted zone within
the beam areas closer than any NOHD. In the enclosed projection area the combination of two restricted zones are relevant: The
restricted zone of the projected beam toward the screen; taking into account 1 meter Separation Width (SW) from the beam onward.
Combined with the restricted zone related to the rear reflection from the screen (HDreflection); also taking into account a 1 meter lateral
separation.
The HDreflection distance equals 25% of the difference between the determined HD distance and the projection distance to the rear
projection screen. To determine the HD distance for the used lens and projector model see graphs in chapter "HD in function of
modifying optics", page 9 .
HDreflection = 25% (HD – PD)
The light emitted from the screen within the observation shall never exceed the RG2 exposure limit, determined at 10 cm. The
HDdiffuse can be neglected if the measured light at the screen surface is below 5000 cd/m² or 15000 LUX.
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1.6 HD in function of modifying optics
DP2K-15CLP Hazard Distance
Image 1-4
DP2K-20CLP Hazard Distance
Image 1-5
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