Hi fredericjulien13,

to calculate the output of 5 mm LEDS for cm2 you take the output of one LED and
multiply it by 4 because you get 4 LEDs in a Square Centimeter. So if the LED
puts out say 14 mw that would be 56 mw.

the only way to get that much out of a RED 5 mm LED is to get to the high power
metal ones or LUxeon type. they make nice power arrays with multiple LEDs on a
metal back that can put out out tons of light.

Look for Luxeon Floods
http://www.google.com/search?hl=en&q=Luxeon+Floods&btnG=Google+Search

The LED units I make put out about 25 mw per cm2 for the 660 red. I can get
stronger ones for the 6235 or 630nm




Take care,
V


> hello,

> I need to create a device for phototherapy for skin treatment.
> I've seen many on internet but the values given in technical
> caracteristics are strange and seems unreachable like in the siloueth
> tone device:
> http://www.silhouet-tone.com/product/specialized/soli-tone-
> 2500/soli-tone1.html or the Omnilux revice:
> http://www.phototherapeutics.co.uk/index.asp?AccessID=&sectionID=15

> they give an output of 105 mW/cm2 in red 630 nm ? but, it seems that
> they use 5mm LED but even with the brightest I've found I connot reach
> that level. to reach such level I have to use High power LEd like
> LUXEON K2 but the heat dissipation is a real problem.

> did someone know what kind of LED are used for those application.

> best regards



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