Beautiful Outdoor Lighting
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Recommended Lamping Guidelines 75-L
The following guidelines represent maximum wattage recommendations for Faribo Manufacturing Company standard enclosures. The maximum internal temperature to avoid distortion within a 24-hour period is 90 degrees Celsius (194 degrees Fahrenheit).
Globe Diameter | Polyethylene | Lexan Polycarbonate | ||||
Incand. Watts: | MV Watts: | MV + R Watts: | Incand. Watts: | MV Watts: | MV + R Watts: | |
8" | 100w | NR | 50w | 100w | NR | 50w |
10" | 150w | NR | 50w | 150w | NR | 50w |
12" | 200w | 50w | 100w | 200w | 50w | 100w |
14" | 200w | 50w | 175w | 200w | 50w | 175w |
16" | 300w | 100w | 250w | 300w | 100w | 250w |
18" | 300w | 175w | 250w | 300w | 175w | 400w |
20" | XXX | XXX | XXX | XXX | XXX | XXX |
21" | 500w | 175w | 400w | 500w | 175w | 400w |
21" | XXX | XXX | XXX | XXX | XXX | XXX |
24" | 500w | 175w | 500w | 500w | 175w | 400w |
30" | 750w | 250w | 750w | 750w | 250w | 1,000w |
Notes:During all tests the top of the lamp was centered within the sphere.Incand. = Incandescent LampsMV = Mercury Vapor LampsMV+R = Mercury Vapor Plus Heat Reflector (#9153 Which Is 4" Diameter & Mounted Approximately 4" from Top of Sphere)XXX = Spheres Not AvailableNR = Not Recommended
I. Heat Test Procedure used to determine lamping guidelines #75-L, September 1, 1975
A. Lamp Location – An adjustable post top fitter which allows the top of the lamp to be located in the geometric center of the plastic enclosure.
B. Measurement of Heat Thermocouples mounted on the inside surfaces of the plastic enclosure. Lamps listed in guidelines are determined by the maximum lamp size which still does not cause the interior surface of the enclosure to exceed 65°C (149°F), or 90°C (194°F), depending on the material limitations.
II. Other methods of heat testing
1. Crayons – Temperature Sensitive | 2. Paints – Temperature Sensitive
III. Lamps listed are recommendations only. Due to the variety of fittings and light fixtures that do not comply with our recommended lamping guidelines, #75-L should be individually heat tested. It must be a responsibility of the fixture manufacturer to avoid premature aging due to overheating.