Author Topic: f4t5 color shift at eol  (Read 188 times)
Lumex120
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f4t5 color shift at eol « on: October 02, 2015, 02:25:59 PM » Author: Lumex120
In this picture, the f4t5 lamp is living the last moments of it's life. It was a cool white lamp, but something interesting I observed is that the color temperature got warmer as the lamp died.  It didn't change much, but went from 4200k to about 3500k. Why is this?
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Solanaceae
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Re: f4t5 color shift at eol « Reply #1 on: October 02, 2015, 03:22:41 PM » Author: Solanaceae
Interesting effect. Normally, the lamp will shift to a bluer color due to higher Mercury vapor pressure. Unless the thing here was the glow from the ends tricking you, or extreme phosphor decay.
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