Hi Paul,

those are nice LEDs I have some of them. but the 500 mw figure is not the output
of the LEDs that is how much energy they can dissipate basically and does not
indicate their output. I think lots of manufacturers might use that figure to
tell the output of their LEDs.
At the most those 10 mm LEDS might put out 30 mw, but probably more like 15 to
20.

For red 5 mm LEDs you might get around 6 to 7 mw output, blue ones con put out
around 14 mw, infrared ones at 880 nm put out around 6 and ones around 850 can
put out about 12 to 14 mw

So if you see figures up there in the triple digits for 5mm LED output they are
bogus. A plastic LED can't put out that much without burning up.

I send most of the LEDS I use to somebody that has a machine that measures the
actual output of the light. And those are the figures I get back.

So when you read various websites with them telling you they have high figures
for the output you better check close what numbers they are publishing. the
dissipation figure is not the output, that is how much energy the LED can
dissipate in heat and light without it burning up. And if you put a bunch of
LEDs together in an array the figure changes because now to dissipate that much
you have to put fans on there to remove the heat. Or run them for only a short
amount of time.


Take care,
V


>
>
>
>
>
>
>
> Here?s a link for 10mm leds they are 130,000mcd, 500mw and at
> 620nm. It?s an ebay store called shop4leds. I bought some of these and they
are super bright.
>
>
>
>
http://cgi.ebay.com/10-PCS-10mm-40-5-Chips-0-5-Watt-Red-LED-100mA-150Kmcd_W0QQit\
emZ220285088384QQihZ012QQcategoryZ66954QQtcZphotoQQcmdZViewItemQQ_trksidZp1742.m\
153.l1262
>
>
>
>
>
>
>

>
>
> From: LEDeffects@yahoogroups.com
> [mailto:LEDeffects@yahoogroups.com] On Behalf Of fredericjulien13
> Sent: Friday, February 13, 2009 9:42 AM
> To: LEDeffects@yahoogroups.com
> Subject: [LEDeffects] wich type of LED necessary for phototherapy treatment
for skin rejuvenation
>
>
>
>
>
>
>
> 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
>
>
>
>
>
>
>

--