About 6 months ago I had to change some older style (larger diameter)
fluorescent bulbs (about 3 or 4 foot long as I recall) in my kitchen.
I have 2 pair and each pair are installed in their own housing. I
noticed even after changing the bulbs all around and plastic lenses
covering them, that it seems that the bulbs in one housing are always
yellower than the other (which is more white). Is this a ballast
problem? They seem to all turn on okay.
I see what you mean by diffuser... around here they call it a lense
panel or such. Anyway I believe I even swapped them too or took them
off for no solution. I guess I need to take them off again to be
100% certain. Thanks meanwhile.
Diffuser is the plastic cover.
They do make "warm white" and "cool white" bulbs. Maybe they are from
different batches? I see you changed the bulbs. Not sure what else to offer.
Christopher A. Young
Learn more about Jesus
Yep, I did swap them. Before I google it, what is a diffuser? Easy
remains the same when you move bulbs from fixture to fixture?
Is there a difference in the coulour of the "reflector"? I've never
heard of a ballast affecting coulour temperature or perceived light
It has nothing to do with the ballast, may have to do with the Kelvin rating
of the bulbs...they come in different Kelvin ratings, higher is bluer; lower
is warmer. Here's a temperature chart, pics on left are common fluorescent
It's not a ballast problem. Ballasts don't control the color of a
Fluorescent tubes are made in several different colors. If you just grab
one from the store shelf, it's very likely to be a different color than the
tubes that are now in the fixtures. The best way to see if the tubes are
supposed to be the same color is to check the markings or lamp code printed
on the lamp. The color is part of that lamp code. So, if the lamp codes
are all exactly the same, they're all the same color.
For example, a 4-foot GE fluorescent tube 1 inch in diameter might be marked
as an F32T8/SP30/ECO. The color part of that lamp code is the "SP30". But
each manufacturer uses a different system for designating color.
The diffusers or lenses that cover the tubes can indeed fade or change color
(they usually turn yellow). Cleaning won't change that. But they can be
replaced if the fixtures are of a common make. To check for color shift,
just open the fixture or remove the diffuser and look through it to see if
colors look different.
Eventually I will get back into that fixture to check the bulbs. Many
of you convinced me it's not the ballast so either it's the diffuser /
panel or it's the bulb. Too many to thank in this thread so please
allow this post to say thanks to all of you..... sorry if I didn't put
all the names here <grin>. Appreciate it guys !!!!
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