At 10:37 PM 8/14/2011, RussellMc wrote:
> >>I'm thinking of trying to make a small softbox and was wondering if
> >>anyone knew what kind of LEDs professionally made ones (like this:
> >>http://www.bhphotovideo.com/c/product/608408-REG/Litepanels_LP1_SS=20
> _LOW_1X1_Low_Profile_LED.html)
> >>use?
>
> > Judging by the photo, they look like an array of 576 5mm LEDs, with 529
> > through holes between the LEDs. That would be around 20mA per LED, for
> > ~40W total dissipation including PSU losses.
>
>Rushing ...
>
>They claim 40 Watts.
>
>As of about 1.5 years ago only one LED maker in the world (Nichia) was
>making 5mm white phosphor LEDs with lifetimes over 10,000 hours,
>according to them any way :-).
>
>Most will now use fewer and larger LEDs.
>Reputable manufacturers are (probably) achieving lifetimes over 70,000
>hours under specific operating conditions.
>Disreputable ones often claim 100,000 hours.
>
>Note colour temperature that you want.
>Note that there is MUCH discussion on LED goodness as a white light source=
..
>I recently downloaded a 'quality'  article that analysed some real
>world results and showed that even some top class LED sources produced
>some very unexpected and unnacceptable results in some situations.
>
>Aim for highest affordable CRI.
>You can improve CRI by adding in additional colours.

What do you think of their mixing of different colo[u]r temperature
LEDs to allow adjustability of the overall colo[u]r temperature?


>More later maybe.
>
>
>  Russell
>--
>http://www.piclist.com PIC/SX FAQ & list archive
>View/change your membership options at
>http://mailman.mit.edu/mailman/listinfo/piclist

Spehro Pefhany --"it's the network..."            "The Journey is the rewar=
d"
speff@interlog.com             Info for manufacturers: http://www.trexon.co=
m
Embedded software/hardware/analog  Info for designers:  http://www.speff.co=
m



--=20
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist
.