Hi All,
I have been using red (660nm) LEDs for a while now with no side effects. In fact the 400+ LEDs seem to be very effective at calming a general red face and supressing the flushing (moderate flushes) the next day.. I use it for at least an hour every night.
I noticed that people comment that their face appears calm and non-red after using it and not to burst people's bubbles but there maybe a reason why this is so. After the first time I used it - no goggles, just eyes shut - and then went for a walk outside I noticed that the street lamps which were normally orange in hue all had a green/blue tint to it. It faded after about 10-20 minutes. I noticed it now when looking at my clock/radio after a session as well.
I think my LEDs DO calm my face, but your first glance is not accurate..
See here ->
" The red-sensitive cells in that region start to grow tired and stop responding strongly to red light. A white board reflects red, blue, and green light to your eyes (since white light is made up of all these colors). When you suddenly shift your gaze to the blank white board, the fatigued red-sensitive cells don't respond to the reflected red light, but the blue-sensitive and green-sensitive cones respond strongly to the reflected blue and green light. As a result, where the red-sensitive cells don't respond you see a bluish-green bird. This bluish-green color is called cyan"
So I think we tire out a red receptors in the eye with an extended period of sitting under bright red light so that we when stop and look at our faces in the mirror our eyes are just not as responsive to the red in our face as there were beforehand. Having said this, it does return to normal 20 mins or so later, and I do still notice a general calming of the skin.
For what its worth.
Liz