Re: Solux [was Ott-Lite]
Re: Solux [was Ott-Lite]
- Subject: Re: Solux [was Ott-Lite]
- From: Roger Breton <email@hidden>
- Date: Tue, 17 Feb 2004 11:03:28 -0500
>
I bought two Solux bulbs and built an adjustable regulated DC power supply to
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run them. I can set the voltage accurately to keep a stable and uniform color
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temperature.
I bought a Cosel K150AU-12 13 amp 12 V regulated DC power supply for $19.95
on eBay and that's what I now use to drive two 4700K 35 degreee Solux bulbs
(0.4V ripple). And I bought several of the 4700K Solux bulbs to experiment
with. I found that at rated 12V I don't get the rated 4700K but more like
4200K, other people have also replicated my findings using more rigorous
apparatus and testing. Anyway, at about 13.8 V I do get 5000K CCT out of
these bulbs. Which is all I need to start using them in my work.
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Once the distance is about 0.5 m from the lamps, the
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illumination
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looks uniform.
You mean uniform as in "constant illuminance" or "constant chromaticities"?
Because, with the seven such such bulbs I've tried so far, I am NOT getting
uniform chromaticities out of these lamps, which is, at very the least,
quite annoying. I found out it has to do with the design of the blue filter
used inside the lamp to coat the reflector surface.
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It is a nice reference to have so I do not have to worry about
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peaks and valleys in a fluorescent light.
Right. That's what I, and a number of other people feel too.
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Drawbacks: Since they are incandescent, they get hot and the light area is
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smaller than a typical viewing booth.
I can leave with the radiated heat and I find that, two lamps at a distance
of 1 meter, are providing even illumination on an area of about 18" wide by
12" high, at the correct P2 500 Lux level.
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The power supply does not have to be as
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fancy as I built but it is a little tricky if it is an electronic one, since
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the
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startup current is very high of an incandescent bulb and it will often
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overload
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the supply.
Yup, I noticed if I increase the voltage too much on my Cosel, I loose it.
But after a while it eventually (thank god!) comes back.
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You are also right about Ott-Lite. They are very good at marketing.
In think they have an interesting product. But I think the reason of their
success is the ever difficult problem of finding lamps that bear any
resemblance to "daylight" -- whathever one can make of this term. There are
not too many offerings in the "good color rendering" segment of the light
market.
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Interestingly, they refused to give out the patent numbers although the box is
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marked "patented". They claimed that it was confidential. I got curios and
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got
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copies of them. Their patents are not really related to color accuracy, it
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has
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to do with the mechanical design of the end caps acting as "radiation
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shields".
Imagine...
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Yes, I have one of their lamps too, OTL-13TCG, and it works pretty well but I
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do not trust it like the Solux.
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Bertho
That's the exact model I got! 5840K (Ott-Lite OTL-13TCG) vs 5000K (Solux
4700K bulb driven at 13.8V). But I am still not satisfied with the Solux.
Call me perfectionnist but, lately, I got some Normlicht ColorControl 5000K
fluorescent tubes and I am starting to like them better than my
GretagMacbeth and GTI tubes.
Regards,
Roger Breton | Laval, Canada | email@hidden
http://pages.infinit.net/graxx
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| | >Re: Ott-Lite (From: "Bertho Boman" <email@hidden>) |