Francis Searchlights FH380RC User manual

User Instruction & Installation Manual
FH380 Remote Control Variable Speed Twin Head
Metal Halide Searchlight
Product Reference Number:
A7210 - FH380RC 1200w Twin Head 240v
Manufacturer’s details: Distributor details:
Manual Part Number: C29455
Issue: 1 4.3.22
Francis Searchlights Ltd
Union Road, Bolton
Lancashire, BL2 2HJ, UK
Tel: [phone]
Fax: [phone]
http://www.francis.co.uk
E-mail: [e-mail]

CONTENTS
1 - Introduction
2 - Safety Precautions
3 - Technical Information
4 - Unpacking and Installation Instructions
5 - Electrical Installation
6 - Operating Instructions
7 - Fault Finding
8 - Maintenance and Servicing
9 - Wiring Diagram & General Assembly
10 - Spare Parts List

1 - Introduction
It is imperative that this manual is read carefully and understood before
installing your equipment. For your future reference please keep this
manual in a safe place.
Thank you for specifying a product from the Francis Searchlights range. All Francis products
are designed to give complete customer satisfaction and are manufactured to the highest
engineering standards to ensure optimum performance and service life.
The Francis FH range combines features proven over many years service in the most
hazardous conditions in both marine and land installations.
To prolong the life and performance of your product, we recommend that you only specify
Francis Searchlights spare parts. This will also ensure that any warranties on your equipment
will not be invalidated. Information on spares ordering and parts is provided in this manual.
Should you ever need to contact Francis Searchlights Ltd. regarding your equipment, please
always quote the Product Serial Number.
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2 - Safety Precautions
The following instructions must be adhered to, to ensure a safe working environment and the
safety of the user.
Note: When unpacking or manoeuvring the searchlight into its fixing position, suitable
lifting points must be used to prevent damage to the equipment or personal injury.
◼Prevent rain, snow, condensation, and water droplets from contacting the lamp as this may
cause bulb failure and possible shattering.
◼Quartz bulbs run with a high internal pressure more than atmospheric. Whilst the
construction is inherently strong, there is a slight risk of the bulb shattering.
◼Never look directly into an illuminated searchlight as this may cause severe damage to
eyesight. If it is necessary to inspect a lamp whilst in operation, always wear suitable
protective goggles.
◼Should it be necessary to examine the lamp with the front bezel removed, always use a
protective shield and wear goggles to ensure a safe working environment.
◼Never attempt to clean a lamp whilst in use.
◼Searchlights get hot. Never touch the unit when lit and always allow 15 to 20 minutes for
cooling down after turning the searchlight off.
◼Never place anything on or cover the searchlight when in use.
◼Ensure the lamp has cooled sufficiently before removal.
◼If undue force appears necessary to remove the lamp, the equipment should be inspected
by a competent person or contact the manufacturer.
◼When breaking a lamp for disposal, care must be taken to ensure the glass fragments are
safely contained. This operation must be performed out of doors in free air. In all
circumstances refer to the lamp manufacturer’s instructions packed with the lamp.
◼Due to the vast range of lamps available it may appear possible that more powerful lamps
can be used in the equipment than for which it was designed. Even when the unit will
physically accept a higher wattage or voltage lamp, this substitution is not recommended
and is dangerous. This action will also void any warranties on the equipment.
Always refer to the lamp manufacturer’s technical data when dealing with lamps.

3 - Technical Information
This product has been designed to operate in accordance with the product specification. The
FH380RC Twin Head searchlight has the following features:
◼All marine grade materials and fixings.
◼Parabolic glass reflector.
◼Powder coated & stove enamel paint finish.
◼Instant lamp re-strike. No cooling down time required.
◼Economical 1000-hour lamp life.
◼385° horizontal rotation.
◼Vertical movement +30° to -35˚.
◼Variable speed 1-23/sec (Pan), 1-8/sec (Tilt).
◼Remote focus facility.
◼Heaters in the motor gearbox and searchlight head.
◼Toughened super clear Optiwhite front glass.
◼Luminous flux 110,000.
◼Colour temperature 6,800K.
◼RS485 connectivity & auto home positioning.
◼Variable Speed LED Joystick panel, Dimmable.
◼Searchlight Weight 85Kg.
◼Control Gear Weight 23Kg each.
◼Sealing –IP66 Gearbox, IP56 Searchlight & PSU IP66.
The searchlight also performs to the following optical data:
◼Supply voltage 240v
◼Wattage 1200w
◼Peak Beam Candlepower 33,700,000 Lux with standard glass
◼Peak Beam Candlepower 26,960,000 Lux with ultraviolet glass
◼Range 5,805 metres (standard glass)
◼Range 4,644 metres (ultraviolet glass)
◼Divergence Spot 2° to Flood 10°
◼Operational temperature with heater -50°C
In order that the searchlight operates correctly it is imperative that competent personnel are
responsible for the installation, operation, and servicing of this equipment. Failure to adhere to
this advice may cause premature failure or incorrect operation of the searchlight, which may
damage the equipment or cause personal injury.

4 - Unpacking and Installation Instructions
The following instructions should be read and fully understood prior to installing the equipment
to ensure that the correct procedures are followed, and all safety precautions are observed.
Note: If the equipment has been in storage for a considerable amount of time, it is
advisable to conduct a routine maintenance check on all parts before installation.
Safety Precautions
This equipment should not be connected to an electrical supply before being installed.
Installation procedures should be adhered to, to ensure a safe working environment and
reduce the risk of damage or personal injury.
Preparing the Mounting Position
Mark out and drill the fixing holes through the deck (refer to drawing C21501). If anti-vibration
mounts are to be fitted, the fixing holes for the mounts should also be marked out and drilled.
Prior to manoeuvring the searchlight into its’ fixing position, the AV mounts should be fitted to
the base. When in the desired position, bolt the searchlight firmly down. On an uneven surface
it may be necessary to use a suitable sealant such as silicone, to ensure a weatherproofed
joint.

5 - Electrical Installation
Note: ~
When the main power is first applied to the searchlight, the searchlight will carry out a
self-test, it will Pan to the left limit and Tilt down to the limit, once this is complete, the
searchlight will then move to the centre and horizontal, during this please do not try and
operate the searchlight while this test is being carried out. Once the searchlight is back
at centre the searchlight can then be operated normally, by pressing the 1/0 button on
the control panel.
For safety purposes, only competent personnel should perform the electrical installation. All
equipment should be installed to current Electrical Regulations and Standards.
To obtain the maximum light output from the searchlight, it is essential that the full operating
voltage of the lamp fitted be applied to the lampholder contacts.
.
Method of Electrical Connection
1) Disconnect the supply before working on the electrical system.
2) The searchlight must be connected to a fused electrical supply, using suitably sized cable.
3) If the searchlight is located a considerable distance from the supply, provision must be
made in the cable size to overcome the voltage drop.
The following table below indicates the maximum length of cable to be used for the AC
supply cable (Butyl HO7 RN-F) to the Junction Box:
Searchlight
240v 1200w
Cable Size (mm²)
Distance Max
1.5
62 MTRS
2.5
101 MTRS
4.0
160 MTRS
6.0
249 MTRS
10.0
417 MTRS
4) Whenever possible cable terminations should be made below deck and with approved
terminal devices.
5) If a spare auxiliary fuse or circuit breaker is not available, one of the correct type/ratings
should be fitted and connected to a positive supply. It is advisable to locate a bus bar or
main connection and avoid any direct connection to the supply:
6) For 220v AC products, the following colour coding system should be used for the customer
supply cable:
Brown - Live
Blue - Negative
Green/Yellow - Earth

Installation Guidelines
A typical installation and connection routine for the FH380RC searchlight is as follows:
Referring to wiring diagram C29454 a supply is fed to the junction box, which then provides a
common feed to the control gear, motor gearbox, searchlight, and joystick panel.
The searchlight has been pre-wired with 3 meters of cable from the motor gearbox to the
junction box provided. The searchlight heads are pre-wired along with the connecting cable to
the motor gearbox.
Cables required to be connected by the customer: -
2 pair twisted 0.22mm 100ohm screened cable from the joystick panel to the junction box.
5 core 1.5mm cable from both control gear to the junction box.
Supply cable to the junction box.
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6 - Operating Instructions
This equipment is designed for use out of doors, in free air. Never place anything on or cover
the searchlight when in use as this may present a hazard.
Switch On
The panel is activated using the 1/0 button. This will illuminate brightly when the panel is active.
Lamp Control
When the panel is active pressing the LIGHT, button will switch the lamp on or off.
If the control panel is switched off with the 1/0 button the lamp will switch off.
Focus Control
The lamp focus can be adjusted using the FOCUS button. Lamp focus will adjust continuously
whilst FOCUS is pressed.
Beam Direction
The beam direction can be adjusted using the joystick when the panel is active. Moving the
joystick left or right will pan the beam clockwise or anticlockwise.
Moving the joystick up or down will move the beam up or down. The speed of movement is
proportional to the movement of the joystick. It is possible to move the beam in both directions
at once by moving the joystick diagonally.
Home
The lamp can be returned to a pre-set home position. By default, this is dead ahead with the
beam level although different positions can be programmed as described below.
Set New Home Position
To set a new home position move the lamp to the new desired home position. Switch the panel
off then press the joystick down to its limit and press the lamp 1 button. The current position will
now be the new home position.
Set Motion Limit (only available when Remote Focus is fitted)
The lamp travel can be limited in either axis and either direction. To set a new limit, switch the
panel on and move the lamp to the desired limit position. Switch the panel off then press and
hold the focus 1 button whilst moving the joystick full travel in the direction of the desired limit.
Hold in this position for 4 seconds. For example, to set a limit to the tilt up motion; -
1. Switch panel on and drive the searchlight to the desired tilt up limit position.
2. Switch panel off.
3. Press and hold the FOCUS 1 button and hold joystick in the full up position for 4
seconds.
4. Tilt up motion will now be inhibited above the current position.

Clear Motion Limits
Motion limits as set above can be cleared by switching the panel off then pressing and holding
the focus 1 button and lamp 1 buttons together for 10 seconds.
Adjusting Panel Illumination
The panel illumination intensity can be adjusted to suit ambient light levels. To adjust the
intensity, switch the panel on then switch it off with the 1/0 button and keep the 1/0 button
pressed. To increase intensity, move the joystick to the right. To decrease move to the left.
Note that the 1/0 button must be kept depressed whilst the joystick is moved. All indicators will
illuminate whilst adjustments are performed. Adjustment is complete when the 1/0 button is
released.
Obtaining Fault Status
Fault codes can be accessed by switching the control panel on with the 1/0 button and keeping
the 1/0 button pressed for 10 seconds. Fault codes are indicated by the 1/0 button flashing a
number of times related to the fault. Fault codes are detailed below. If more than one fault is
present the 1/0 button will indicate them in sequence.
1. Pan Limit. –Either of the pan limit switches operated. Note that this
may not actually be a fault. The LED will flash when a limit switch is
operated under normal circumstances i.e., the lamp is at the limit of
travel. This will also indicate when a variable limit is reached.
2. Tilt Limit. –Either of the tilt limit switches operated. Note that this may
not actually be a fault. The LED will flash when a limit switch is
operated under normal circumstances i.e., the lamp is at the limit of
travel. This will also indicate when a variable limit is reached.
3. Pan motor over current. –The pan motor is taking excessive current.
The motor will be disabled for a period when this occurs. Fault
indication will remain until power is removed or the fault is corrected.
4. Tilt motor over current. –The tilt motor is taking excessive current. The
motor will be disabled for a period when this occurs. Fault indication
will remain until power is removed or the fault is corrected.
5. Focus motor over current. –The focus motor is taking excessive
current. The motor will be disabled for a period when this occurs. Fault
indication will remain until power is removed or the fault is corrected.
6. FBUS interface over current. –The speed control card supplies 24VDC
to the remote-control panels. This fault indicates the 24VDC output is
taking excessive current. The FBUS supply output will switch off. To
restore this output, remove the supply from the speed control card for a
period.

7. Anti-condensation heater output over current. –The 24VDC anti
condensation heater output is taking excessive current. The heater
output will switch off. To restore this output, remove the supply from the
speed control card for a period.
8. Limit Switch Error. Some lamp types do not use all or some limit
switches. If an invalid limit switch input is detected it is probable the
speed control card is set to the wrong product or there is a wiring error.
9. Datum Error. The start-up datum system has not completed correctly.
10.Product type not set or corrupt. The product type has not been set, has
been set incorrectly or is corrupt.
11.Supply voltage out of tolerance. The 24V supply is outside the range
18-30V.

FBUS SPEED CONTROL ASSEMBLY DETAILS
MAINS CONNECTORS
L Live.
N Neutral
E Earth
TILT CONNECTOR
MR Tilt Motor Red Wire (+)
MB Tilt Motor Black Wire (-)
ER Tilt Encoder Red Wire (5V). (Voyager Brown Wire)
EG Tilt Encoder Green Wire (Phase A Output) (Voyager Yellow Wire)
EW Tilt Encoder White Wire (Phase B Output)
0V Tilt Encoder Black Wire (Voyager Blue Wire)
Tilt Limit Switch Common Black Wire
UL Tilt up Limit Switch Orange Wire
DL Tilt down Limit Switch Blue Wire
PAN CONNECTOR
MR Pan Motor Red Wire (+)
MB Pan Motor Black Wire (-)
ER Pan Encoder Red Wire (5V)
EG Pan Encoder Green Wire (Phase A Output)
EW Pan Encoder White Wire (Phase B Output)
0V Pan Encoder Black & Pan Limit Switch Common
CL Pan Clockwise Limit Switch Orange Wire (As viewed looking down on lamp)
AL Pan Anticlockwise Limit Switch (As viewed looking down on lamp)
HEAD CONNECTOR
0 0V Common for Heater & Focus (If Searchlight has an igniter terminal is not used)
H Heater Active High Output
F Focus Motor Active High Output
FP Focus position potentiometer
HEAD 2 CONNECTOR
0 0V Common for Heater & Focus (If Searchlight has an igniter terminal is not used)
FP Focus position potentiometer
F Focus active high 5v output
L Lamp active high 5v output
24 24v supply out
FBUS CONNECTOR
0 OV out to Joystick Panels
T Line Terminate (Connect to + for terminate)
+ FBUS Data +
- FBUS Data -
24 24V Supply out to joystick panels

24 VOLT INPUT
- Negative
+ Positive
LAMP RELAY
Relay input
Relay output
FBUS Speed Control Board

FBUS EXTENSION CONTROL BOARD DETAILS
HEAD CONNECTOR
0 0V Common for Heater & Focus (If Searchlight has an igniter terminal is not used)
H Heater Active High Output
F Focus Motor Active High Output
FP Focus position potentiometer
HEAD 2 CONNECTOR
0 0V Common for Heater & Focus (If Searchlight has an igniter terminal is not used)
FP Focus position potentiometer
F Focus active high 5v output
L Lamp active high 5v output
24 24v supply out
LAMP RELAY
Relay input
Relay output
FBUS Extension Control Board

CONNECTIONS TO FBUS JOYSTICK CONTROL PANEL
FBUS CONNECTOR
0 OV Supply Input
T Line Terminate (Connect to + for terminate)
+ FBUS + RS485 Data In/Out
- FBUS - RS485 Data In/Out
24 +24V Supply Input
JOYSTICK CONNECTOR
BK Joystick Black Wire
Y Joystick Yellow Wire
BL Joystick Blue Wire
R Joystick Red Wire
FBUS JOYSTICK CONTROL BOARD

FBUS ADDRESS SWITCHES
OVERVIEW
FBUS uses two types of address switch. One type is rotary, and the value selected is the value
shown on the dial. The other type is rows of switches whose operation is described below: -
The switches all operate in the same manner producing a binary value with the highest binary
value to the left and the lowest value to the right. The values for each switch are listed below: -
SPEED CONTROL CARD LAMP ADDRESS
SWITCH NUMBER VALUE
SWITCH 10 1
SWITCH 9 2
SWITCH 8 4
SWITCH 7 8
SWITCH 6 16

FBUS DATA PROTOCOL
OVERVIEW
The Francis bus (FBUS) is a custom communication protocol based on
RS485 two wire bi-directional communication hardware. The system provides
a simple bi-directional link between lamps and lamp control panels. The
system allows given panels to communicate with different lamps and also
allows a number of panels to communicate with the same lamp.
DETAILED DESCRIPTION
The FBUS system runs at 38.4K Baud. This low data rate facilitates longer
cable runs and complements the fairly small amount of data transfer required
whilst still providing a fast response. The data frame is 11 bits with 9 data bits,
one start and one stop bit. A simple error detection system is employed which
is described in detail later. Data is sent LSB first.
To prevent data collisions the system uses a polling technique. Lamp number
0 is the default bus master and controls timing of all communications by
polling other units connected to the bus. If lamp 0 is not operating or powered
down, lamp 1 automatically becomes the bus master as will lamp 2 if lamp 1
is not operating.
The system differentiates between address and data values by setting data bit
8 high for an address. Panel 2 address would therefore be sent as hex 102 or
binary 100000010. The lamps and panels use different address ranges with
panels being addresses 0-15 and lamp addresses starting at 16 and going up
to 56. A lamp whose address was set to 0 on the address switches will
actually be address 16 and would be transmitted as hex 110 or binary
100010000.
If lamp 0 is active this becomes the bus master and sequentially transmits the
full address range. No other units will transmit until they receive their address.
Each address is followed by a 1mS dead period where the master switches
from transmit to receive and monitors the bus for activity. If activity is present
the master will not transmit the next address until 1mS after bus activity
ceases. After the full panel address range has been sent (addresses 0-15) the
master starts to send lamp addresses.
These operate slightly differently in that, if more than three successive
addresses do not illicit a response, the bus master will assume the last lamp
has been polled and re starts the data cycle by reverting to panel address 0.
When a remote panel receives its address, it will send data if it has any to
send, if not, no data will be sent. Lamps operate differently in that they will
always send data after they have seen their address on the bus.
Panels can send data to any lamp therefore they transmit a modified lamp
address value prior to the lamp command(s). The modified address is
received by lamps and, if it matches their own address, the command(s)
which follow will be received and processed.
A detailed description of panel and lamp data follows.

PANEL TRANSMITTED DATA
Panels only send data when there is data to be sent i.e., there has been
activity at the panel which must be sent to a given lamp. If there is no data to
be sent, a panel will not transmit. The amount of data a panel sends will
depend upon the amount of activity at the panel and can be 2 to 10 bytes. The
commands described below are sent after a panel receives its address which
it uses as indication that it has a transmit time slot. Before any commands are
sent the panel must define which lamp the data pertains to. This is achieved
by preceding the command with a lamp address. Note that bit 7 is not set
when a panel defines the lamp to which it is to transmit. Lamps recognise the
address and receive data when the address matches their own. To send
commands to lamp number 2 a panel would precede the lamp command(s)
with the address value Hex 2, Binary 000000010. It is important to note that
multiple commands must be sent in numerical order i.e., a command with
value 01 must be sent before a command with 06 etc.
Panel transmit commands are listed below; -
DATA_PAN_JOYSTICK (Hex 01)
This is a two-byte command and must be immediately followed by another
byte whose value determines the lamps direction and speed. The value is
centred on 128 and has a range of 128 +/- 64. A value of 130 will make the
lamp rotate slowly clockwise. Increasing the value will make the lamp move
faster. A value of 126 will make the lamp rotate slowly anticlockwise.
Decreasing the value will make the lamp move faster. Transmitting values 01
then C0 would make the lamp pan clockwise at full speed.
DATA_TILT_JOYSTICK (Hex 02)
This is a two-byte command and must be immediately followed by another
byte whose value determines the lamps direction and speed. The value is
centred on 128 and has a range of 128 +/- 64. A value of 130 will make the
lamp point upwards slowly. Increasing the value will make the lamp move
faster. A value of 126 will make the lamp move down slowly. Decreasing the
value will make the lamp move faster. Sending values 02 then C0 would make
the lamp tilt up at full speed.
DATA_LAMP_BUTTON (Hex 0A)
This is a single byte command. The same command is sent to switch the lamp
on or off. This command must only be sent once for each press of the button.
Sending again will switch the lamp again. Basically, if the lamp was off,
sending this value will switch it on. If the lamp was on, sending this value will
switch it off. This technique is employed to facilitate simultaneous lamp control
from a number of different panels. Basically, what is sent is just information
that the lamp on off button has been pressed. How the lamp reacts to this
depends on the lamp’s current status. Most of the other lamp button
commands operate in a similar manner except the focus button. Confirmation
that the command has been received can be obtained by reading the lamp
status byte described below.

DATA_FOCUS_BUTTON (Hex 0B)
This is a single byte command. When the lamp receives this, it will run the
focus motor as long as the command remains. A panel will send this
command so long as the focus button is pressed.
DATA_HOME_BUTTON (Hex 0C)
This is s single byte command. A lamp receiving this will automatically move
to the pre-set home position. The command does not need to be maintained
while the lamp moves to home.
DATA_RECORD_BUTTON (Hex 0D)
This is a single byte command. The first time a lamp receives this command it
will enter record mode and start monitoring all movement and lamp switching
information. Recording will continue until the command is received again
when it will stop recording. As with most of the button commands it is
essential this command is just sent once. Confirmation that the command has
been received can be obtained by reading the lamp status byte described
below.
DATA_PLAY_BUTTON (Hex 0E)
This is a single byte command. The first time this is received a lamp will start
playing back any movement / lamp switching activities which were recorded
using the record function above. This will continue until the command is
received again or the lamp receives a move command
(DATA_PAN_JOYSTICK or DATA_TILT_JOYSTICK).
DATA_HOME_LP (Hex 0F)
This is a single byte command which activates when the home button is
pressed and held for 5 seconds (Home Long Press). This is used to store a
new home position. A lamp receiving this command will store the current
position as the value to move to when the home button is pressed normally.
Note that a lamp can only receive up to 10 bytes at a time. A panels transmit
sequence is the modified receiving lamp address followed by data commands
then the CRC. The CRC is formed by the sum of all the commands + the lamp
address value –note however that the address value used in the CRC is the
unmodified value (Bit 7 clear).
DATA_PAN_POSITION (Hex 18)
This is a three-byte command. Following the DATA_PAN_POSITION
command two data bytes specify the position to which the lamp must move.
The bearing resolution is 0.1 degrees. The value is sent LSB first with the first
byte representing the lower position command bits. The MSB (sent last) lower
4 bits represents the remaining value. The position value is centred on 2048
(Binary 1000 0000 0000) so a value of 2048 would make the lamp move to
the dead ahead position. An increasing value represents a clockwise motion
with a resolution of 0.1 degrees. A value of 2058 would therefore represent 1
degree clockwise (2058 = 2048 + 10 –but resolution is 0.1 degrees so a
value 10 = 1 degree). Values below 2048 represent anticlockwise motion so a
value of 1048 would represent an angle 100 degrees anticlockwise of centre.

DATA_TILT_POSITION (Hex 19)
This is a three-byte command. Following the DATA_TILT_POSITION
command two data bytes specify the position to which the lamp must move.
The bearing resolution is 0.1 degrees. The value is sent LSB first with the first
byte representing the lower position command bits. The MSB (sent last) lower
4 bits represents the remaining value. The position value is centred on 2048
(Binary 1000 0000 0000) so a value of 2048 would make the lamp move to
the dead ahead position. An increasing value represents tilting up with a
resolution of 0.1 degrees. A value of 2058 would therefore represent 1 degree
up from dead ahead (2058 = 2048 + 10 –but resolution is 0.1 degrees so a
value 10 = 1 degree). Values below 2048 represent tilting down so a value of
1748 would represent an angle 30 degrees down from centre.
LAMP TRANSMITTED DATA
A given lamp after it receives its normal address (Hex 110 to Hex 138) will
always send the following data in this specific order. The lamp must transmit
its first data byte (pan position) within 1mS of receiving its standard address
and the gaps between successive bytes must be less than 1mS.
Lamp TX Byte 1 –Pan position LSB
Lamp TX Byte 2 –Pan position MSB
Lamp TX Byte 3 –Tilt position LSB
Lamp TX Byte 4 –Tilt position MSB
Lamp TX Byte 5 –Lamp status
Lamp TX Byte 6 –CRC
Each byte is described below
Pan Position
This is a 12-bit value with lamp pointing straight ahead being a value of 2048
and the value increasing as the lamp rotates clockwise as viewed from above.
The system has a resolution of 0.1 degrees so 90 degrees clockwise from
centre would be a value of 2948 (2048 + 900).
Tilt position
This is a 12-bit value with lamp horizontal being a value of 2048 and the value
increasing as the lamp beam points up. This has a resolution of 0.1 degrees.
Lamp Status
This is an 8-bit value with each bit representing a specific status aspect. The
bit functions are listed below; -
Bit 0 - Lamp on
Bit 1 - Pan Limit reached
Bit 2 - Tilt Limit reached
Bit 3 - Lamp Recording
Bit 4 - Lamp Playing
Bit 5 - Lamp Overheated
Bit 6 - Lamp moving to home
Bit 7 - Reserved
The bits are all true logic so if the lamp is switched on, bit 0 will be high.