ATTENTION: The following fixture information is for reference only.
Resolution of any sitespecific issues, i.e. HVAC needs, fire safety, or any other heat-related installation questions
are the sole responsibility of the customer.
We are happy to provide the following heat information on Source Four luminaires to be used by
persons familiar with the luminaire location and qualified to speak to the safety of surrounding
materials.
Please note:
The following factors may be used, but are not the sole factors, for determining the suitability of a location for a high-temperature luminaire:
- Composition, color and texture of the surrounding materials
Temperature measurements taken in ambient air at any distance from a luminaire in a lab situation are not useful as safety guidelines for luminaire mounting in that they cannot accurately factor in the above or any other variables.
It is the SOLE and EXCLUSIVE responsibility of the customer to determine the suitability of
any location for luminaire mounting.
How much “Heat” in BTUs does a Source 4 fixture emit?
For each watt of energy consumed, the fixture will emit 3.4144 BTUs per hour. Keep in mind that S4
and S4 Jr fixtures absorb more of the infrared light spectrum than most typical fixtures, and therefore
transmit less heat to the stage. Therefore:
575 HPL * 3.4128 = 1963.28 BTUs per hour
750 HPL * 3.4128 = 2560.8 BTUs per hour
Additionally we periodically get asked about the amount of heat in the beam compared to the amount
of heat absorbed by the fixture. Below shows some representative figures.
Note: Regardless of how much heat is projected by the beam or dissipated by the fixture housing, the total BTU
per hour measurement is the same as computed by the above equation.
Note also the dramatically lower amount of heat in the beam of fixtures with the cold mirror reflector: Source
Four and Source Four PAR MCM, when compared to fixtures with typical reflectors.
Typical Heat Dissipation of ETC Fixtures (All measurements are BTUs per Hour)
Incandescent Products
Fixture: Source Four 750w
Projected Light Beam: 230
Fixture Housing Dissipated: 2330
Total: 2560
Fixture: Source Four 575w
Projected Light Beam: 180
Fixture Housing Dissipated: 1780
Total: 1960
Fixture: Source 4 375w
Projected Light Beam: (not available)
Fixture Housing Dissipated: (not available)
Total: 1280.4
Fixture: Source Four PAR EA 750w
Projected Light Beam: 1150
Fixture Housing Dissipated: 1410
Total: 2560
Fixture: Source Four PAR EA 575w
Projected Light Beam: 880
Fixture Housing Dissipated: 1080
Total: 1960
Fixture: Source Four PAR MCM 575w
Projected Light Beam: 145
Fixture Housing Dissipated: 1815
Total: 1960
Fixture: Source Four HID 150w, Source 4 XT
Projected Light Beam: (not available)
Fixture Housing Dissipated: (not available)
Total: 513
Fixture: PAR 64 1000w
Projected Light Beam: ~1100
Fixture Housing Dissipated: ~2314
Total: 3414
Fixture: Fresnel 2000w
Projected Light Beam: (not available)
Fixture Housing Dissipated: (not available)
Total: 6828
Fixture: Source Four Mini
Projected Light Beam: (not available)
Fixture Housing Dissipated: (not available)
Total: 170.6
LED Products
Fixture: Source 4 LED Lustr+
Projected Light Beam: (not available)
Fixture Housing Dissipated: (not available)
Total: 443.5
Fixture: Source 4 LED Studio Daylight
Projected Light Beam: (not available)
Fixture Housing Dissipated: (not available)
Total: 558.7
Fixture: Source 4 LED Studio Tungsten
Projected Light Beam: (not available)
Fixture Housing Dissipated: (not available)
Total: 537.4
Fixture: Source 4 LED Studio HD
Projected Light Beam: (not available)
Fixture Housing Dissipated: (not available)
Total: 433.8
Fixture: Desire D40, D40XT
Projected Light Beam: (not available)
Fixture Housing Dissipated: (not available)
Total: 375.6
Fixture: Desire D60
Projected Light Beam: (not available)
Fixture Housing Dissipated: (not available)
Total: 549.7
Fixture: Selador Vivid
Projected Light Beam: (not available)
Fixture Housing Dissipated: (not available)
Total: 553.1
Fixture: Selador Vivid-R, Fire, Ice, Lustr, Pearl
Projected Light Beam: (not available)
Fixture Housing Dissipated: (not available)
Total: 426.8
Fixture: Selador Paletta
Projected Light Beam: (not available)
Fixture Housing Dissipated: (not available)
Total: 368.8
What is the Gate Temperature of a Source Four ERS?
In a test condition created by placing one shutter blade into gate covering 1/2 of field, and
placing the thermal probe on the backside (shaded) of the shutter, the maximum S4 gate temps
(A-size) were recorded as follows:
HPL 575w/115v/300hr = 622°F
HPL 750w/115v/300hr = 786°F
Note: We have not tested the 150w HID lamp, but would roughly estimate the S4 gate temp between 300°F ~
450°F.
Surface Temperatures
Note: The following temperatures are normalized for the maximum of 45°C (113°F) ambient room temp, with free air convection.
S4/S4 Zoom/750w
- Lamp Focus Knob: 210°C (410°F) max.
- Exterior Rear Housing Skin: 217°C (423°F) max.
- Exterior Front Barrel Skin: 91°C (196°F)
- Gate temperature of a Source Four ERS:
In a test condition created by placing one shutter blade into gate covering 1/2 of field, and placing the thermal probe on the backside (shaded) of the shutter, the maximum S4 gate temps (A-size) were recorded as follows: HPL 750w/115v/300hr=786°F
- Projected Heat: Lighted objects will not exceed a temperature of 90°C (at 45°C ambient) from projected light at a horizontal distance of 0.8m (~2.7 feet) or greater.
S4jr/S4jr Zoom/575w
- Lamp Focus Knob: 210°C (410°F) max.
- Exterior Rear Housing Skin: 235°C (455°F) max.
- Exterior Front Barrel Skin: 110°C (230°F)
- Gate temperature of a Source Four jr ERS:
In a test condition created by placing one shutter blade into gate covering 1/2 of field, and placing the thermal probe on the backside (shaded) of the shutter, the maximum S4 gate temp (A-size) was recorded as follows: HPL 575w/115v/300hr=622°F
- Projected Heat: Lighted objects will not exceed a temperature of 90°C (at 45°C ambient) from projected light at a horizontal distance of 0.6m (~2.0 feet) or greater.
S4PAR-MCM/575w
- Lamp Cap Handle: 185°C (365°F) max.
- Reflector Fins: 270°C (518°F) max.
- Exterior Front Barrel Skin: 175° (347°F) max.
- Projected Heat: Lighted objects will not exceed a temperature of 90°C (at 45°C ambient) from projected light at a horizontal distance of 0.9m (~2.9 feet) or greater.
S4PAR-EA/575w
- Lamp Cap Handle: 145°C (293°F) max.
- Reflector Fins: 175°C (347°F) max.
- Exterior Front Barrel Skin: 165°C (328°F) max.
- Projected Heat: Lighted objects will not exceed a temperature of 90ºC (at 45C ambient) from projected light at a horizontal distance of 2.0m (~6.6 feet) or greater.
S4jr HID/150w CDM lamp
Jrs tend to run hotter than full-sized fixtures with the same wattage lamp so the jr data represents worst case.
Note: HID temperatures are normalized for 40°C (~104°F) ambient room temperature, with free air convection.
- Exterior Rear Housing Skin: 103°C (218°F) max.
- Exterior Rear Burner Assembly: 100°C (~212°F)
- Gate temperature of a Source Four HID ERS:
We have not tested the 150w HID Lamp but estimate for a test condition created by placing one shutter blade into gate covering 1/2 of field that the maximum S4 gate temp (A-size) is between 300°F to 450°F.
Question: How much heat do your fixtures emit?
Answer: For each watt of energy consumed, the fixture will emit 3.4144 BTUs per hour. Keep in mind that S4, S4jr, and S4 PAR-MCM fixtures absorb more of the infrared light spectrum than most typical fixtures due to the cold mirror optical coating on the reflector, and therefore transmit significantly less heat to the stage. The S4 PAR-EA does not contain this feature and projects the full infrared spectrum to the stage.