Ceravision UV420 User manual

Introduction
Thank you for purchasing the Ceravision UV420 unit. This unit has a unique spectrum with unparalleled levels of UV-A and UV-B. The UV420
is designed to complement traditional PAR grow-lights. With a spectrum concentrated from 280 to 550nm, it delivers the UV-A and UV-B not
transmitted through greenhouse glass and not available from PAR lights.
Research has shown that plants benefit in many ways from timely exposure to UV-A and UV-B. UV induces photomorphogenic reactions in
most plants, enhancing the production of secondary metabolites that boost aroma, flavonoids, terpenes, colour, nutritional and medicinal values.
UV can also improve defences against insect and fungal infections.
The following is a guide to the installation, use and maintenance of the UV420 unit. Please read carefully before installation and only use the unit
in accordance with the directions in this guide.
This unit is not intended for general lighting purposes.
Pack Contents
1. Ceravision UV420 unit fitted with ‘Blue light & UV-A’glass filter (white frame):
2. ‘Enhanced UV-B’glass filter (red frame); and
3. 3-metre power cable.
Fig 1: Exploded View of the UV420 Unit
B. Hanging Brackets
H. Reflector Hinges
E. Heat Sink
G. Reflector Mounting
J. Glass filter
I. Glass filter Retaining M4 Socket
F Alternate Filter
D. IEC Power Input Socket
A. Mounting Points
C. Fans
UV420 Plasma Grow-Light User Guide

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Doc No. CVL2018-2390 v5 –May 2020 1
Fig 4: ‘Enhanced UV-A’Glass Filter
(Blue frame)
The unit is supplied with the ‘Blue light and UV-A’glass filter (white frame) fitted in the unit and the ‘Enhanced UV-B’glass filter (red frame) as
the alternate glass filter retained on the side of the unit.
The ‘Enhanced UV-A glass filter’(blue frame) can be purchased separately if required from your supplier.
Symbols Used
Warning! A warning indicates severe damage to the user and/or product may occur when a
procedure is not carried out as described.
Caution! A caution sign indicates problems may occur if a procedure is not carried out as
described; it may also serve as a reminder to the user.
UV risk Group 3 IEC 62471. WARNING: UV emitted from this product. Avoid eye and skin
exposure.
Not to be mounted on normally flammable surfaces.
Note: A note gives additional information, e.g. in respect of a particular procedure.
This symbol indicates that parts of the fixture can reach very high temperatures (>85°Celsius).
A cool down period is necessary before performing maintenance.
With this symbol, Ceravision declares that this product complies with legal European
requirements.
This symbol indicates that any cracked protective shield must be replaced.
The symbol on the material, accessories or packaging indicates that this product may not be
discarded as household waste. Dispose of the equipment through a recycling centre that
handles electronics and electrical appliances within the EU and in other European countries
that use separate collection systems for used electronics and electrical appliances. By
disposing of the equipment in the proper way, you will be helping to prevent possible risks to
the environment and public health, which might otherwise be caused by improper handling of
the discarded equipment. Recycling of materials contributes to the conservation of natural
resources. This product must be disposed of in an environmentally sound manner when it is
discarded, e.g. at the end of its life. Please refer to the terms & conditions of sale for details of
the WEEE Producer Compliance Scheme available to Ceravision customers.
This symbol is an internationally recognized symbol used to designate recyclable materials.
Applicable Standards
EN 60598-1: 2015
Luminaires –part 1: General requirements and tests.
EN 62471: 2015
Photobiological safety of lamps and lamp systems.
EN 61000-3-2: 2014
Electromagnetic compatibility (EMC). Limits. Limits for harmonic current emissions
(equipment input current ≤16 A per phase).
EN 61000-3-3: 2013
Electromagnetic compatibility (EMC). Limits. Limitation of voltage changes, voltage
fluctuations and flicker in public low-voltage supply systems, for equipment with rated
current ≤ 16 A per phase and not subject to conditional connection.
EN 61547: 2015
Equipment for general lighting purposes. EMC immunity requirements.
EN 55011+A1 2016/2017
Industrial, scientific and medical equipment. Radio-frequency disturbance characteristics.
Limits and methods of measurement.
EN 50581: 2012
Technical documentation for the assessment of electrical and electronic products with
respect to the restriction of hazardous substances.
Fig 3: ‘Enhanced UV-B’Glass Filter
(Red frame)
Fig 2: ‘Blue light & UV-A’Glass Filter
(White frame)

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Fig 5: Top View of Unit
Fig 4: Side Elevation of Unit
Recommendations for Use
The unit is intended for use in indoor damp and humid conditions but NOT for use outdoors or in very wet conditions. Do not expose the unit to:
1. Ambient temperatures in excess of 30oC; or
2. Environments with excessive dust; or
3. Environments with excessive moisture; or
4. Direct water spray.
The unit is hot when in use and may cause burns. Allow to cool after disconnecting power before handling. The unit emits UV radiation in the
UV-A and UV-B ranges. The amounts of UV-A and UV-B depend on the glass filter used in the reflector assembly (see Section 7).
UV420 Installation
Refer to local rules and regulations prior to installation.
Prior to installation and use, please check the unit for any signs of damage. In particular, check glass filter for signs of breakage or cracks. DO
NOT power-up or use the unit if there are any signs of damage to the unit or to its power lead. If any damage is present, please return the unit to
your point of purchase.
The unit is fitted with hanging brackets with several mounting points designed to allow for a variety of installation methods. Choose the method
appropriate for your particular use.
Ensure the method used to secure the unit is suitable for safely holding the 10kg unit in a vertical position and without excessive movement.
Ensure that the fans on the top of the unit are not covered.
Once the unit is installed, it can be turned on by connecting the power lead to the IEC socket (see Figure 1) and switching on the power at the
mains. The unit is compatible with standard contacters and plug timers.
The UV420 uses an automatic starting process to excite the plasma and the ignition process will commence immediately.
This process makes a clicking sound and the sound may continue even whilst the plasma has lit. If the unit fails to start, it will automatically try
again after 30 seconds –DO NOT un-plug the unit during this time. It may take several attempts to complete the ignition process and up to five
minutes to light up.
If it fails to start after 10 consecutive attempts then the unit will disable itself and will require repair to rectify the issue preventing successful
ignition; in which case please contact point of sale.
When the unit is switched-off and then on again, it will not attempt to automatically restrike until eight minutes have elapsed.
Selecting Appropriate Glass Filter
The UV420 is able to supply UV-A (315-400nm), UV-B (280-315nm) and visible light (400-800nm) radiation and is designed as a
complementary lighting unit to be used alongside other light sources used for horticulture.
The unit is supplied with the ‘Blue light & UV-A’glass filter fitted in the reflector and the ‘Enhanced UV-B’’ glass filter as the alternate retained
on the side of the unit. The Enhanced UV-A glass filter can be purchased separately if required from your supplier.
Exposure to extended period of UV light can be harmful to crops. However, choosing the right type of ultraviolet at the right time of a particular
plant’s growth cycle can deliver huge benefits.
Different plants benefit differently from UV-A and UV-B at different stages in their growth cycle. The particular exposure-times for UV-A and
UV-B will depend on the plants and the stage in the growth cycle; you should seek expert advice and/or run controlled trials.
The quantity and wavelength of light reaching the crop can be modified according to the glass filter used as shown in the Figures 6 and 7 below:
1. ‘Blue light and UV-A’glass filter (white frame): provides blue light and UV-A;
2. ‘Enhanced UV-B’glass filter (red frame): provides maximum UV-A and UV-B; and
3. ‘Enhanced UV-A’glass filter (blue frame): provides for increased UV-A and UV-B.

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Fig 7: UV420 Spectrum - Relative Light Quantity 280nm to 400nm
Fig 6: UV420 Spectrum - Relative Light Quantity 280nm to 800 nm.
Changing the mounting height of the unit will change the area of coverage provided but also decrease the intensity of the UV and visible radiation
(see Figure 8 below).
Due consideration should be taken of mounting height of the unit with respect to the crop being grown.
In Figure 9 below, the ‘Mounting Height’ is the measurement from the bottom of the reflector housing to the working surface.
Glass Filter Replacement Procedure
To change the glass filter from one type to the other please follow the instructions below:
1. The change of filter can be done with the unit in situ, without removing it from its normal operating position.
2. Turn off the power to the unit; allow the unit to cool.
3. Using a 3 mm hexagonal key undo the M4 socket cap at the top of the reflector casing.
4. Support the glass filter as it swings on its two hooks away from the unit.
5. The M4 socket cap remains in place.
6. Unhook the swinging glass filter from the unit and store safely.
7. Remove the alternate glass filter that is held on the side of the unit.
8. Put the glass filter removed from the unit into the brackets on the side of the unit
9. Hook this replacement glass filter into position.
Fig 8: Contour Plot of the Light Spread of the UV420
Fig 9: Area of Light Coverage Dependant on Unit Height

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10. Connect into the M4 socket cap and tighten the socket cap so that the glass filter is held securely.
11. Check the glass filter and reconnect the power to the unit.
12. Please wait eight minutes before switching the unit back on.
Replacement Glass Filters
The front glass is specifically designed to permit the transmission of specific wavelengths of light. The nature of UV is that the glass filters will
naturally suffer from ‘solarisation’, which means that they lose the ability to control the passage of UV-A and UV-B and will deteriorate over
time. In order to maintain the unique performance of the UV420, we recommend that the glass filters be replaced as follows:
1. ‘Blue light & UV-A’glass filter (white frame) after 24,000 hours of use or 4 years.
2. ‘Enhanced UV-B’glass filter (red frame) after 12,000 hours of use or 2 years.
3. ‘Enhanced UV-A’glass filter (blue frame) after 12,000 hours of use or 2 years.
Always source replacement glass filters from Ceravision or an authorised Ceravision distributer. The use of non-Ceravision authorised glass
filters in the unit will invalidate the Terms & Conditions and Warranty. When ordering replacement glass filters please specify the exact unit
description and glass filter type, e.g. UV420 and the particular glass filter that you require.
Cleaning and Maintenance
External factors such as dust and moisture may cloud the glass and reduce the efficiency of the unit. The unit would therefore benefit from
routine cleaning of the glass. Do not carry out maintenance or cleaning whilst the unit is connected to the mains; disconnect all power and allow
to cool prior to cleaning.
The outside of the unit and the glass can be cleaned using non-abrasive household cleaning materials. Use of abrasive materials may damage the
glass and will invalidate the warranty. Take care not to damage or contaminate the glass filter during cleaning.
During routine cleaning, the unit should be checked for any signs of damage.
Opening the unit itself will invalidate the warranty.
Working with UV
Ceravision’s UV420 unit is an intense light source, which emits UV-A, UV-B and visible light. The unit should never be operated with the light
source directly visible. The reflector housing and glass filter should always be correctly positioned and fitted in the unit at all times during its
operation.
The unit should not be used if the front glass filter is broken or cracked. Check the unit prior to installation and continue to do so during cleaning
and routine maintenance. If the glass filter becomes damaged during use, disconnect the power source immediately and do not use the unit until
the problem is rectified and replacement found.
When working with these units, users MUST be protected from exposure to harmful levels of radiation. Those working with UV-emitting light
sources should be trained in the potential hazards and in the use of suitable protective equipment to prevent harmful exposure.
We recommend you refer to the following HSE publications: ‘Guidance for Employers on the Control of Artificial Optical Radiation at Work
Regulations (AOR) 2010’; and ‘Reducing Health Risks from the use of Ultra-Violet Tanning Equipment’.
We recommend that full body coverage and UV blocking protective glasses be worn in areas where the units are operating. When working with
UV emitting sources, users are recommended to monitor UV levels using appropriate UV-A and UV-B meters and adhere to the exposure limit
values; these are normally displayed as a maximum exposure time in each case.
Further advice on UV safety and UV monitoring equipment is available from UV Light Technology, see www.uv-light.co.uk
High Temperatures
The UV420 unit can reach temperatures in excess of 190oC. Allow to fully cool before handling.
Disposal and Recycling
This product must be disposed of in an environmentally sound manner when it is discarded, e.g. at the end of its life. Please refer to the terms &
conditions of sale for details of the WEEE Producer Compliance Scheme available to Ceravision customers. The user is entirely responsible for
the disposal and/or recycling of this unit.
Technical Data
Product Name
Ceravision UV420
Manufacturer
Ceravision
Power Consumption
420 Watts
Mains Supply Voltage
110-240 Volts at A/C 50-60Hz
Weight
10kg
Dimensions
400mm x 195mm x 400mm
Ambient Operating Temperature
0oC to 30oC
IP Rating
IP20
Current
1.7 to 1.9 Amps.
All data subject to revision.

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Doc No. CVL2018-2390 v5 –May 2020 5
Disclaimer
Ceravision does not authorise its products for use as a critical component where a malfunction or failure may reasonably be expected to result in
significant injury to the user. Information in this publication is provided only for your assistance and is subject to change without notice. Please
read in full prior to commencing installation and retain for future reference.
Guarantee
1. Subject to its UK and Europe Terms & Conditions and Warranty Policy, Ceravision guarantees the Unit for three (3) years based on
maximum burning of 4000 hours/year. In the case of more than 4000 hours/year, this period will be adjusted pro-rata.
2. This Warranty is only valid when the Unit is properly installed and operated as specified in the Product Datasheet. Any repairs or alterations
however minor will invalidate this warranty.
3. If a Product is found to be defective, the Purchaser must notify Ceravision in writing prior to expiration of the warranty period.
4. Please refer to website at www.ceravision.com for more details.
The UV420 spectrum targets the key pigments and receptors that influence quality and yield.
Pigment
& Receptor
Peak nm
Absorption
Description & Function
Beta Carotene
- peak 1
280
Metabolism & protection: sunscreens protective high energy wavelengths; the
pigment for rich colours; a carotenoid, antioxidant converted into vitamin A.
UVR8
285-295
Signal protein for sensing UV-B & creating sunscreens that trigger production
of secondary metabolites - Phenolics; Alkaloids; Terpenes; and Lipids.
Cryptochrome
- peak 1
365
Photoreceptor for growth, development and influencing flavonoid synthesis;
stem elongation, stomatal opening, anthocyanin production, and flowering
Chlorophyll a
425
Abundant pigment and primary electron donor during photosynthesis
Beta Carotene
450
See Beta Carotene 280nm
Cryptochrome
450
See Cryptochrome –365nm
Chlorophyll b
453
Absorbs energy not collected by Chlorophyll a and aids shade adaption
Phycoeryththrin
495
Red protein-pigment complex and accessory to chlorophyll
Phycoeryththrin
545-566
See Phycoeryththrin –495nm.
Phycocyanin
620
Absorbs energy for photosynthesis (boosts absorption of full solar spectrum).
Chlorophyll b
642
See Chlorophyll b –453nm.
Phytochrome
- peak 1
660
Regulates flowering; seed germination; chlorophyll synthesis; stem
elongation; size, shape, and number of leaves.
Chlorophyll a
665
See Chlorophyll a –425nm
Phytochrome
730
A lot of far-red cause stems to elongate, leaves to grow longer and wider.
Ceravision, Ceravision House, Sherbourne Drive, Tilbrook, Milton Keynes, MK7 8HX, United Kingdom
t: [phone] e: [e-mail]