Another aspect to remember.
I can't remember off-hand who I had a good email conversation with
regarding LEDs, but he mentioned to me that the CRI was an important
aspect worth considering. This is the measurement of how light renders
the color of objects. The wrong color light will make objects look
weird (think of a blue light on a white surface will make the white
surface blue).
There are a few LED manufacturers (Luxeon) that make LEDs with a warmer
color temp, but I really don't know what the CRI for them is. I have
used the bright white Luxeons (not the warmer color) in an exhibit with
great success, but I was illuminating a sky, so the trace blueness of
the light made it look good.
I'd recommend trying an example of several lamps to find the one that
would best approximate what you are looking for.
Oh, and to echo Marc, from my understanding, light damage is
cumulative. Any time an object is exposed, it adds to the damage, so
these lamps really only delay the damage by removing unnecessary UV.
The best thing to do is limit the overall illumination to the lowest
level possible.
Paul Fritz
--
Paul C. Fritz
Pamplin
Historical Park & the National Museum of the Civil War Soldier
6125 Boydton Plank Road
Petersburg, VA 23803
(804) 861-2408 -- Tel
(804) 861-2820 -- fax
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www.PamplinPark.org