Residential Lighting
Economic Worksheet: Table 1
| Table 1. Power Reduction Factors and Lamp Life Multpliers for Dimmers | ||||||||
| % of Full Light (as perceived by the eye) | 100 | 90 | 75 | 50 | ||||
| % of Full Light (as measured) | 100 | 80 | 56 | 25 | ||||
| % of Time on Dimmer * | 0 | 100 | 50 | 100 | 50 | 100 | 50 | |
| Incandescent Lamps | Power Reduction Factor | 1 | 0.9 | .95 | 0.8 | 0.9 | 0.5 | .75 |
| Lamp Life Multiplier | 1 | 2 | 1.3 | 8 | 1.8 | 20 | 1.9 | |
| Fluorescent Lamps** | Power Reduction Factor | 1 | 0.8 | 0.9 | 0.5 | .75 | 0.3 | .65 |
| *If dimmers are used only for occasional reduction in illuminance, enter 1.0. | ||||||||
| ** Fluorescent lamp life is not significantly affected by dimming, so use the value determined by instruction H. | ||||||||