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View Full Version : $13 DIY 150W HQI Pendant


kwirky
11-11-2006, 01:37 AM
What's needed:
rotary tool screw driver/s side cutters (wire cutters) On Guard 500W halogen floodlight, available at Rona/Home Depot electrical tape


After searching and searching for a Regal lighting fixture in Canada, I decided to give up, and try a DIY with fixture actually available in Canada.

I've decided to use the On Guard, 500 Watt Halogen Flood Light, available at Rona and Home Depot.

http://www.canreef.com/photopost/data/500/box1.jpg

http://www.canreef.com/photopost/data/500/emptylight.jpg

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The flood lights I've found in canada have spring loaded bulb clips, rather than slide in clips like in the American floodlights. The canadian models need more work to mod, but they work in the long run, and considering the 1 hour of total work required, you're saving yourself at least $80 :)

First, I removed the covers over the bulb clips. To get the width needed for the bulb, you move the stationary bulb clip so it is resting against the outside of the fixture. You can keep the clips held in place by reusing some of the clip holding flaps that you removed. Cut little pieces to be stuffed in diagonally to hold in the ceramic clips like shown:

http://www.canreef.com/photopost/data/500/socket.jpg

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One problem I noticed, though, is the bulb clips are fine and safe when using the fixture as is, but when you move the clips, you expose more of the bare wire. So for safety's sake, I put two pieces of electrical tape on the back of each clip to prevent the wires from making contact with the fixture. They're on the very back of the ceramic clips, so I don't think they'll be a fire hazard.

http://www.canreef.com/photopost/data/500/socketBack.jpg

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The spring for the second clip needs modification as well. I cut the spring back to two spirals (fewer than shown in the picture), to make putting in the bulb much easier, and prevent damage to the bulb from fighting the spring loaded clip.

http://www.canreef.com/photopost/data/500/spring.jpg

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Finally, to have the bulb fit in the fixture, you gotta cut cut cut. You can figure out what has to be cut by holding comparing the fixture to the bulb. Just keep cutting until you can get the bulb into the fixture without the bulb touching the metal. Make sure you don't cut the portion of the fixture holding the bulb clips in, or right through the fixture ;)

All in all, you have a finished fixture that only cost like $13 canadian! It has a UV shield included, and hangs perfectly ballanced if you rotate the arm towards the back of the fixture. Temperature shouldn't be an issue, since the fixture was designed for 500W halogen lamps, while here it's only modified for a 150W MH. Plus they're weather sealed, so they should be perfectly fine to suspend over open water, as long as you make sure it doesn't drop in :)

http://www.canreef.com/photopost/data/500/on.jpg

Happy modding! AND DON'T TRY TO FORCE THE BULB IN! If it's not going in yet, either cut more of the stuff jutting from the fixture, or clip the spring back further. You want it going in nice and smooth :). It's better to spend an extra 20 minutes sawing away at the crap inside the fixture than to try to FORCE the bulb in and have it crack on you.

fishface
11-11-2006, 02:00 AM
13 bux!? oh man what a deal but i'm curious about what the bulb k rating and spectrum is...how does it look over your tank? not the actual fixture but the light it produces...

also, what does that $13 include? is it just for the fixture? is there a ballast at all?

kwirky
11-11-2006, 03:00 AM
no ballast, no bulb. just the fixture.

I scared the hell out of my cichlids and briefly held it over half of my 33 gallon cichlid tank to see what it looks like :twised: lol. Couldn't take a picture at the same time, but the 13k bulb was quite strong, but judging it's perceptable colour wouldn't have been fair since there was a lot of yellow rock in the cichlid tank bouncing light all over. Shimmer was great :)

I'm using a geisseman 13000k bulb (bout $100) and a pfo hqi ballast (bout $140). But this saves you about $100 for the fixture, since most pendant fixtures cost about $120+, on TOP of the ballast/bulb you'll have to buy anyways. the $13 is a great price considering the UV shield is included. If you were to retrofit into a canopy, 150/250W HQI bulb clips would run $13-20 anyways, and you'll end up spending about $20 to get the UV glass cut by a glass shop.

It'll be over something like an 18x18x18 cube or the likes. Been planning it for a while now, probably tap it in with my 120 gallon system. It was initially to go over an 18 gallon, 12x18x18 tank, but I upgraded that one to a 120 gallon and now I just use that little "nano" tank for mixing change water in (was a 33 gallon divided in half. I took out the divider, so it's now an ugly 33 long).

midgetwaiter
11-11-2006, 11:24 AM
I built one of these a few months ago out of a fixture which is more or less identical that I got at Home Depot. This is the box.

http://i37.photobucket.com/albums/e88/midgetwaiter/MH%20Fixture/box.jpg

My initial install was pretty close to the way kwirky has shown. I decided that I didn't like that very much, the sockets don't make a very good contact with the bulb and it could come loose quite easily. Arcing from a loose connection can ruin a bulb. I bought a ballast from JSTR and he showed me the way he intended to do it and hadn't got around to yet.

Remove the existing sockets and then get a set of good spring loaded sockets like these http://www.hellolights.com/70w15hqisopa.html and attach them with some screws. The aluminum housing is really easy to get through


Like so
http://i37.photobucket.com/albums/e88/midgetwaiter/MH%20Fixture/sockets.jpg

I've been using it for a few months now, works really well.

Here's how I suspended it in case anyone is interested. The frame is screwed to either side of the stand, eye bolts in the across piece are attached to steel cable with crimpers on it. I attached it to the fixture by sinking a bolt in each side and connecting the cable to it.

http://i37.photobucket.com/albums/e88/midgetwaiter/MH%20Fixture/hanger.jpg

Oh and one other thing, "UV blocking" glass is just regular glass. The piece that comes with it might be tempered to withstand the heat better but you could replace it with whatever you have handy.

kwirky
11-11-2006, 10:26 PM
Remove the existing sockets and then get a set of good spring loaded sockets like these http://www.hellolights.com/70w15hqisopa.html and attach them with some screws. The aluminum housing is really easy to get through

problem is, those are kinda hard to find. hellolights doesn't ship to canada any more either. Kind of a shame, since I see lots of cool stuff on there often. I would have just built my own pendant out of bent aluminum if I could only have gotten the bulb clips.