Re: Solux Bulb color temperature
Re: Solux Bulb color temperature
- Subject: Re: Solux Bulb color temperature
- From: Robin Myers <email@hidden>
- Date: Wed, 18 Feb 2009 05:39:22 -0800
Dear Mr. Breton,
Given that the computed CCTs were only about 100K apart, and that for
that 100K you are giving up more light output (35W vs. 50W), the 5000K
bulbs do not appear to have much of an advantage. That said, if I was
making an installation and I wanted to use Solux but the fixtures were
open sided, then I would probably choose the black sided 5000K, just
to eliminate the yellow light coming out of the sides. I do not
remember seeing a 50W black sided bulb available when I purchased my
samples.
One thing I should mention about the black coating. It is a paint
coating, but not baked on initially. So when first used there is some
outgassing, aka smoke, that comes from the bulb. This can be a bit
disconcerting and might have you rechecking electrical connections, as
did I, until you are sure it is only the paint being baked. I had to
let the fixture run until the smoke subsided before making the
measurements. This black coating is also somewhat fragile and can be
scraped off during handling, especially if prying is necessary to
remove the bulb from the fixture (personal experience here).
As for the PR-655, I wish I could afford one. I am just lucky that one
of my clients owns one and is kind enough to grant me occasional
access. It's sampling interval is 4 nm from 380 to 780 nm.
Robin Myers
On Feb 18, 2009, at 04:32 , Roger wrote:
Robin,
Your findings agree with my humble findings. I don't have the data
with me
but, if memory serves, I could *not* get a better D50 spectrum out
of the
5000K bulbs, even when driven at my regular 13 to 15 volts level. As
as
matter of fact, my conclusion at the time was that the 4700K bulbs
were
better than the 5000K bulbs, no matter what I'd try. So, it was a big
disappointment. Same price, you'll say, for either bulbs, but why
bother
with the 5000K units, I figured?
Lucky you, with your PR-655! Isn't the 655 giving 5nm resolution
only, btw?
Roger
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