Interior Lighting for Designers

Lamp Description Shape Nominal Wattage

Lamp Lumen Depreciation

(LLD) Factors

Fluorescent, continued

Compact, twin-tube T4 5 0.84

Compact, twin-tube T4 7–13 0.85

Compact, quad-tube T4 13–26 0.85

Compact, triple-tube T4 18–70 0.85

Compact, long twin-tube T5 18–80 0.90

High-intensity discharge

Standard mercury clear E28 250 0.88

Mercury warm deluxe white E28 250 0.81

Mercury deluxe white E28 250 0.81

Standard clear metal halide E28 175 0.74*

0.69**

BT56 1,000 0.76

Standard coated metal halide E28 175 0.71*

0.65**

BT56 1,000 0.76

Ceramic metal halide T7 150 0.89

Ceramic metal halide T8 250 0.80

Ceramic metal halide T6½ 70 0.82

Deluxe high-pressure sodium B17 70 0.80

White high-pressure sodium B17 95 0.80

Low-pressure sodium T16 55 0.87

*Vertical lamp orientation
**Horizontal lamp orientation

APPENDIX