Thanks for the clarification, looking at those spec sheets is very
confusing.

-----Original Message-----
From: LEDeffects@yahoogroups.com [mailto:LEDeffects@yahoogroups.com] On
Behalf Of V
Sent: Friday, February 13, 2009 12:38 PM
To: Paul Strouth
Subject: Re: [LEDeffects] wich type of LED necessary for phototherapy
treatment for skin rejuvenation

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-150Kmc
d_W0QQitemZ220285088384QQihZ012QQcategoryZ66954QQtcZphotoQQcmdZViewItemQ
Q_trksidZp1742.m153.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
>
>
>
>
>
>
>

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