[time-nuts] Reducing lab noise with LED lighting
Mark Sims
holrum at hotmail.com
Tue Sep 18 18:59:58 UTC 2012
You have apparently not tried any modern/quality LED bulbs. The Sylvania Ultra series have a 95 CRI (color rendering index). Bridgelux makes some arrays with a CRI over 98. I defy you to tell the difference between the output of those bulbs (or any LED with a CRI over 85) and halogens. My house has a lot of artwork that is now lit by LEDs. I've has a couple of museum directors by and they couldn't.
As far as LED flicker is concerned, lots of LED flashlights dim via a PWM signal. Lots of people can see PWM effects up to over 400 Hz! It shows up like a strobe light effect when the beam is moved around.
Also, white LEDs are NOT pumped by UV. The LED underneath the phosphor is a royal blue color. Lighting LEDs produce no spectrum in the UV or IR bands... that is one reason museums and art galleries use them.
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Personally I find the light spectrum from the CFL's and LED's to be very
unpleasant. I have had to add an incandescent to the lighting in my
office to keep my eyes from straining.
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