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Relative Strength of Selected Common Light Sources in Stimulating the Visual and Circadian Systems
| Type of Light Bulb | Relative Stimulation Per Watt | |
|---|---|---|
| To the Visual System [lumens/watt] | To the Circadian System [circadian stimulus/watt] | |
| Fluorescent 3000K | 100 | 74 |
| Fluorescent 7500K | 100 | 157 |
| Incandescent | 12 | 12 |
| Daylight 6500K | 70 | 133 |
| Clear Mercury (Hg) | 45 | 18 |
| Blue LED (470 nm) | 8 15 |
223 418 |
