Thanks a lot for this info! I noticed this site and thought that the
concept might be worth exploring - http://www.litepanels.com/LP.html
Since I can get 50 white leds for as little as EUR 6, it might be
worth the trouble to experiment. I just need 50 resistors to hook up
the leds in parallel to a 5 V power source that I already have.
In my particular setup I can get as close as 10 inches to the
subjects (4 inch dolls) so this kind of lighting should be more
practical than the Elinchrome lamps with umbrellas that I use now - 2
yards off.
The *istDS allow me to adjust the white balance to the lighting,
holding up a white or gray card before the camera etc. Hopefully,
this will work even with leds!
Regards,
Bertil
11 sep 2005 kl. 18.05 skrev [EMAIL PROTECTED]:
More info on LED light output measurement:
http://www.marktechopto.com/engineering/measurement.cfm
Generally speaking, you should not expect any savings as compared to
tungsten - in power required and especially not in cost of devices.
There are some white LED lamps available for macrophotography - their
advantage over tungsten or flash may be reduced weight and size.
A white LED used as light source for photography is not (yet) a good
idea, especially if decent colour reproduction is required and film is
used rather than RAW power of digital :)
Spectrum of white LED is continuous (contrary to some "urban
legends") -
but distribution within the visible spectrum is different than
tungsten
or daylight colour films expect.
Another problem is quite big variation of (perceived)colour, even
within
one production lot.
More on this:
http://www.maxim-ic.com/appnotes.cfm/appnote_number/3070
cheers,
teem
