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Do I need diffuser for SAD light box? Answered

Most of light boxes I've seen does not seem to have diffuser on them. I guess using UVless leds won't cause problem without diffuser, but doesn't looking at LEDs without diffuser still cause eye problems?
IF I do need one, what kind of diffusing method should I use? ALso, does diffusing decrease light intensity? I would like to create 10,000 lux.



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 I'd think you need a diffuser, otherwise the LEDs would be obnoxious to look at.  I tried to find the lux output of LEDs, but couldn't get any information.  I have the feeling it would be difficult to generate that much output.  LEDs tend to be directional, you'd be better off with fluorescents.  At least, that is my opinion.  

I built a SAD box with 3 daylight fluorescent bulbs--it ended up costing about $200--ugh.  I put a white plastic diffuser over it.  The light is nice.

There is a good Instructable called "SAD Box inspired" that has a design with  CFL light bulbs.

You don't have to look directly at the led's.  Reflected light is just as good.  Some have even postulated that light hitting the skin works as well.