Reference Data and Standards Use

White Light Referece
Many SSL providers have confused the definition of “white” light sources. The following is a summary of white light colors suggested by the author as a standard, which is used in this blog. 

Incandescent White – 2700K (warm with pale yellow/orange tint in appearance)
Halogen White – 2850K (warm with slight yellow tint in appearance)
Warm White – 3000K (warm with hint of yellow tint)
Neutral White – 3500K (neutral tone without noticeable color tint)
Cool White – 4000K to 4100K (neutral tone with very subtle blue tint)
Design/Graphics White – 5000K (noticeably cool color with slight/pale blue tint)
Daylight White – 5500K to 6500K (noticeably bluish white tint)

Efficacy and Efficiency Reference

Source Efficacy – Lumens per watt, or “Source lm/W“, with operating temperature stated in degrees C (ex. 25C), does not include driver or power supply losses and is to be provided as reference only. At no time will this be represented as product applied efficacy for use in applications other than the inclusion in a product.
Luminaire Efficacy – Lumens per watt, or “Luminaire lm/W“, to include ALL losses through the power supply, driver, controller, and optical system, with ambient operating temperature stated in degrees F (ex. 70F). Under no circumstances are luminaire efficacies to be stated without operating system and optical losses included.
Efficiency% of total source light output at operating temperature escaping a luminaire. Includes all optical losses from lenses and reflector components. Efficiency can also be defined by conversion efficiency. For example, UV light products are frequently identified in photonic watts output. This can be extrapolated to produce a plug-watt efficiency value (ex. a 10W LED delivering 3W of photonic energy is 33% efficient).

Source Efficacy References:

Incandescent General Service lamps:
50 watts or less – 11 lm/W
50 to 125 watts – 17 lm/W
Over 125 watts – 20 lm/W
Halogen lamp to 250 watts – 18 lm/W

Fluorescent Lamps (based on mean lumens, all at 3,000k color):
Up to 26 watts, retrofit screw base – 48 lm/W
Up to 42 watts, plug in triple tube – 55 lm/W
Long Twin Tube – 57 lm/W
T12 Energy Saving – 72 lm/W
T8 Energy Saving – 87 lm/W
T5 Energy Saving – 90 lm/W
T5 HO – 86 lm/W

High Intensity Discharge Lamps (based on mean lumens):
Up to 100 watt Metal Halide, coated lamp – 40 lm/W
150 to 250 watt Metal Halide, coated lamp, pulse start – 55 lm/W
400 watt Metal Halide, coated lamp, pulse start – 72 lm/W
Up to 250 watt High Pressure Sodium – 98 lm/W
400 and 1000 watt High Pressure Sodium – 114 lm/W

LED Low Power – 85 to 135 lm/W
LED Mid Power – 85 to 170 lm/W
LED High Power – 75 to 150lm/W

Luminaire Efficacy Reference:

Incandescent downlight with 60W A19 lamp – 9 to 11 lm/W
Incandescent reflector lamp downlight with PAR lamp and reflector trim – 9 to 17 lm/W
Incandescent reflector lamp downlight with PAR lamp and black baffle – 5 to 12 lm/W
Halogen downlight with elliptical reflector and baffle – 10 to 15 lm/W
CFL Downlight 42W triple lamp – 28 to 36 lm/W
Metal Halide downlight – 32 to 37 lm/W
Fluorescent lensed troffer with T12 lamps – 41 to 47 lm/W
Fluorescent parabolic troffer with T8 Lamps – 60 to 67 lm/W
New generation direct/indirect recessed fluorescent with T5 lamps – 82 lm/W
High Bay Industrial reflector, Metal Halide lamp – 36 to 47 lm/W
Low Bay Industrial reflector, Metal Halide Lamp – 40 to 50 lm/W
Parking Garage luminaire, Metal Halide Lamp – 38 to 45 lm/W
Parking Garage luminaire, High Pressure Sodium Lamp – 64 to 80 lm/W
Decorative wall sconce – white acrylic diffuser, CFL plug-in lamp – 13 to 20 lm/W
Decorative wall sconce – white acrylic diffuser, incandescent lamp – 4 to 7 lm/W
Fluorescent under-cabinet light, T5 lamp – 35 to 47 lm/W
LED Downlight – 50 to 95 lm/W
LED Troffer – 65 to 135lm/W
LED Site Area Outdoor – 70 to 135 lm/W

Rated Service Life – Per ASSIST, the rated service life of an LED product will be either to 70% (L70) or full light output for commercial products or 50% (L50) of full light output for residential products. Note that this assumes that the driver and power supply components remain in operation for the period of time that the LED lumen depreciation occurs.

Sources and luminaire products must be tested using the IES LM79 standards, with sources tested using the IES LM80 test standard, utilizing TM-21 calculations for lumen maintenance.  Future standards are likely to include more fidelity in the reporting data, as well as L90 service life ratings.