8 ms·

Seems pretty easy to duplicate with LED bulbs with these characteristics: CRI: 85 or above Color Temp: 4000K About 70-80W of CFL, so that might be around 60W of

Seems pretty easy to duplicate with LED bulbs with these characteristics: CRI: 85 or above Color Temp: 4000K About 70-80W of CFL, so that might be around 60W of LED. Using omnidirectional bulbs, perhaps 7-8 mounted near each other all shining to get the same 10,000LUX intensity at your face.

ortusdux 11y ago
Thanks for the reply. I'm using about 250W of 5050 led ribbon to decorate my house for the holidays. The strips I've purchased look like they will blend into my crown moulding seamlessly. I think I will try and use an arduino to rig them up to slowly work their way to full brightness 15 minutes before my morning alarm. Something tells me I will wake up before the alarm goes off...
baccheion 11y ago
The color temperature used should probably be 5700K, as that closely resembles sunlight. Sunlight-like light can negatively affect your circadian rhythm (body always thinks it's day time), however.
jacobolus 11y ago
You should look at the spectral power distribution. CRI (color rendering index) score and CCT (correlated color temperature) are pretty uninformative metrics. The CCT just tells you (approximately) how the relative excitation of short vs. medium/long cones in the eye from a particular lamp compares to that of a black body radiator, and the color rendering index tells you how whether a particular set of paint chips looks roughly the same under your lamp as it would look under either daylight or an incandescent bulb (or some value based on linearly interpolating between the two, depending on color temperature). To judge color differences, the CRI takes cone responses and multiplies by a matrix (chromatic adaptation transform), and then uses a standard color difference formula. Most of the so-called “full spectrum lamps” have a spectrum nothing at all like sunlight. It’s not at all clear what kind of spectrum would help fight seasonal depression, but I suspect you want a bit of near ultraviolet radiation, which wouldn’t be measured by either CCT or CRI.

ortusdux 11y ago

Thanks for the reply. I'm using about 250W of 5050 led ribbon to decorate my house for the holidays. The strips I've purchased look like they will blend into my crown moulding seamlessly. I think I will try and use an arduino to rig them up to slowly work their way to full brightness 15 minutes before my morning alarm. Something tells me I will wake up before the alarm goes off...

baccheion 11y ago

The color temperature used should probably be 5700K, as that closely resembles sunlight. Sunlight-like light can negatively affect your circadian rhythm (body always thinks it's day time), however.

jacobolus 11y ago

You should look at the spectral power distribution. CRI (color rendering index) score and CCT (correlated color temperature) are pretty uninformative metrics. The CCT just tells you (approximately) how the relative excitation of short vs. medium/long cones in the eye from a particular lamp compares to that of a black body radiator, and the color rendering index tells you how whether a particular set of paint chips looks roughly the same under your lamp as it would look under either daylight or an incandescent bulb (or some value based on linearly interpolating between the two, depending on color temperature). To judge color differences, the CRI takes cone responses and multiplies by a matrix (chromatic adaptation transform), and then uses a standard color difference formula. Most of the so-called “full spectrum lamps” have a spectrum nothing at all like sunlight. It’s not at all clear what kind of spectrum would help fight seasonal depression, but I suspect you want a bit of near ultraviolet radiation, which wouldn’t be measured by either CCT or CRI.