can you use high pressure sodium lamps to treat s.a.d seasonal affective dissorder?
will these work? I have some and I have s.a.d, but the light boxes are so expensive surely hps will work,any advice thanks
It depends on the specifics of the bulb. You want to look for a Kelvin, or simply K temperature, first and foremost. The sun at noon is around 5500K, so this is around what most full spectrum bulbs are–5000-6500K. Closer to 5500K, the better.
The second thing to look for is the bulb’s CRI index–this is a measure of how closely a bulb/lamp can portray colors as opposed to the sun. The sun rates at 100CRI, and good full spectrum bulbs are around 91-98…
Honestly, most HPS lamps are really more around 2500K-3500K, and 40-60CRI, which is not going to help too much with SAD symptoms in my experience…
If cost is a factor, I would look to compact fluorescent full specrtum bulbs. Some types can even be screwed into regular light sockets.
Again, shoot for 5500K and at least 91>CRI…
Very noisy HPS light
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