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Old 06-08-2004, 03:45 PM   #1 (permalink)
 
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I've been looking into replacing one or more of my diy lights with newer fixtures. The lamps are mostly T8s and since the choice of PC lamps readily available in the US is pretty bad I'll probably stay with T8s. I've been wondering about building better reflectors into my DIY fixtures.

I can draw up profiles for the reflectors but I'm not sure what kind of material to use or how to get a nice specular finish on the reflectors. Any ideas?


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Old 06-08-2004, 04:29 PM   #2 (permalink)
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Roger, would a reflector from AHS work? I am just wondering. If it does then it will save you time from making one. I've never tried one for NO lights. Wonder if it does make the output more efficient.


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Old 06-09-2004, 11:27 AM   #3 (permalink)
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Roger,
You are the man I have been looking for!!! I'v posted on this board as well as many others and didn't get the response I was really looking for.
I have a large quanity of a material that is in my opinion, every bit as reflective a s the the material that the AH Supply reflectors are made from. It is available to me in very large quanities at a very reasonable price.I also have access to a brake so I can pretty much bend the reflectors into any configuration that I chose. What I lack, is the knowledge to configure the right design to work with NO tubes. AH Supply reflectors were designed to be used with compact fluorescent bulbs and leave a lot to be desired when used with regular tubes I would even bend you up a couple, send them over to you, and let you try them out. At no charge to you of course.
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Old 06-09-2004, 01:40 PM   #4 (permalink)
 
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Hoop,

What is the material? How long a piece can you bend? (not interested in more than 4 feet). Can you bend curves or do you need angles?


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Old 06-09-2004, 03:10 PM   #5 (permalink)
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Roger,
I can bend curves or angles, angles being the easier of the two. This is a mirror polished aluminum. I duplicated an AH Supply reflector using this material and installed them side by side in a DYI hood. For the life of me, I can see absolutely no difference what so ever between the two. They have both been in place over 6 months. I have been experimenting with this material for over a year now but could never hit on the right configuration for use with NO bulbs. 4 foot sections are not really a problem, but thought I would experiment on something smaller until I was satisfied with the result.
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Old 06-09-2004, 05:15 PM   #6 (permalink)
 
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Hoop,

Here is the general concept:

The picture is not quite to scale, so the angles are a little messed up. The lamp sits 0.1 inches in front of the center of the reflector. The reflector is not intended to focus the light, but to harvest the light that would otherwise go away from the water or restrike the tube. By design this reflector should get pretty much all of the light from the lamp and put it down toward the water.

The curves are ideal. I haven't quite figured out how to best simplify it to a few angles.


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Old 06-10-2004, 10:05 AM   #7 (permalink)
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Roger,
You may not be able to simplify it down to a few angles. The curve may have been what I was lacking in previous experiments. Wouldn't you want the reflector to extend down past the bulb a little on the sides? Where the curves meet at the top of the bulb could you insert a flat spot, say about 1/2", for mounting purposes? Would this distract from the effectivness of the reflector?
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Old 06-10-2004, 11:30 AM   #8 (permalink)
 
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I put a variation of the double parabolic design in a community album because I couldn't figure out how to upload to image to this thread.
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Old 06-10-2004, 01:56 PM   #9 (permalink)
 
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Nillo, where is the album?

Hoop, I stopped the reflector where I did because if I extend the same curve downward then it starts curling under the light. It might be possible to improve the effect by extending the reflector down a little, but I'm not sure about that.

I don't think a 1/2" flat spot right behind the lamp is a good idea. That would be half the width of the lamp itself and would just reflect a lot of the light back into the tube. The idea is to get that light reflected out from behind the tube. I expect that sheet metal reflectors would be mounted either at the top of the curve in the reflector or at the ends, not directly behind the lamp.


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Old 06-11-2004, 09:53 AM   #10 (permalink)
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Roger,
When you say behind the tube do you mean directly above the tube? I Would love to see that double parabolic design that Nillo is refering to. How do I access the community album?
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