Table 1 Characteristics of each light condition
From: Effect of quantity and intensity of pulsed light on human non-visual physiological responses
Condition | HS condition | MM condition | LL condition | Incandescent | |||
|---|---|---|---|---|---|---|---|
Light-emitting diode | Blue light | White light | Blue light | White light | Blue light | White light | |
Condition | High intensity Short pulse width | Long pulse width | Medium intensity Medium pulse width | Medium pulse width | Low intensity Long pulse width | Short pulse width | Incandescent |
Irradiance (μW/cm2) | 30 μW/cm2 | 14.75 μW/cm2 | 15 μW/cm2 | 14.75 μW/cm2 | 7.5 μW/cm2 | 14.75 μW/cm2 | 14.48 μW/cm2 |
Pulse width (μs) | 50 μs | 950 μs | 100 μs | 900 μs | 200 μs | 800 μs | 1000 μs |
Peak wavelength (nm) | 467 nm | – | 467 nm | – | 467 nm | – | – |
Photopic illuminance (lx) | 24.00 | 44.00 | 12.23 | 44.00 | 6.00 | 44.00 | 16.00 |
Scotopic illuminance (lx) | 351.00 | 53.00 | 176.00 | 53.00 | 88.00 | 53.00 | 20.00 |
Photon density (1012 photons/cm2/s) | 72.12 | 44.35 | 36.06 | 44.35 | 18.03 | 44.35 | 49.72 |
Photon density (log photons/cm2/s) | 13.86 | 13.65 | 13.56 | 13.65 | 13.26 | 13.65 | 13.70 |
Melanopsin-stimulating intensity (μW/cm2) | 24.65 | 2.41 | 12.32 | 2.41 | 6.16 | 2.41 | 0.97 |
At retinal level products of melanopsin-stimulating irradiance and pulse width per 1 ms (μW/cm2) | 1.23 | 2.29 | 1.23 | 2.17 | 1.23 | 1.93 | 0.97 |
Summation of products of blue and white pulsed light per 1 ms (μW/cm2) | 3.52 | 3.40 | 3.16 | – | |||