Reference Efficacy Info

 The  following is a guide of efficacies one might expect from common lamp and luminaire combinations:
Lamp Efficacy:

Incandescent General Service lamps:
50 watts or less-- 11 L/W
50 to 125 watts-- 17 L/W
Over 125 watts-- 20 L/W
Halogen lamp to 250 watts-- 18 L/W
Fluorescent Lamps (based on mean lumens, all at 3,000k color):
Up to 26 watts, retrofit screw base-- 48 L/W
Up to 42 watts, plug in triple tube -- 55 L/W
Long Twin Tube-- 57 L/W
T12 Energy Saving-- 72 L/W
T8 Energy Saving-- 87 L/W
T5 Energy Saving-- 90 L/W
T5 HO -- 86 L/W
High Intensity Discharge Lamps (based on mean lumens):
Up to 100 watt Metal Halide, coated lamp-- 40 L/W
150 to 250 watt Metal Halide, coated lamp, pulse start-- 55 L/W
400 watt Metal Halide, coated lamp, pulse start-- 72 L/W
Up to 250 watt High Pressure Sodium-- 98 L/W
400 and 1000 watt High Pressure Sodium-- 114 L/W

Luminaire Efficacy:

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