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Old 12-15-2002, 12:35 PM   #11
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Lights

I borrowed one from a friend last night. It is a LoA Work Light and it says on the box 8500K lumens...I have to admit,,,VERRRRRY Bright for such a small light..Hard to look at and it seemed my fish had to adjust to it also....It is a very white light with just a hint of blue....I would say, two of these and 2 actnics and it would look awesome...The LR looked like LR!!!

One down side to it....HOTTTT ! I ran it for 1 Hour and the casing was well over 150 degrees... If in a canopy you will definately need goood circulation.....I am going to work on a design for a 55 gal canopy to house 2 of them with 2 Actnics....I like the color it gives out so, I will work on solving the heat issue...I would imagine that it is no hotter than a 250 MH....?????
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Old 12-15-2002, 07:15 PM   #12
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The color is pretty white. I didn't see much blue but I'm also a bit color blind. I did put a 20 watt 50/50 on with it and saw things on LR I had never seen before. The big thing I am still trying to figure out.

If the watts rating is amount of electric used. 65
Lumens is light intensity. 8200
kelvin is color. 6500k

Then how is this compared to MH. 250 used
Lumens. 8000
Color 6700
Why isn't this the same amount and color of light costing a lot less to buy and use?
Also timbo check you lite I'm running mine 9 hrs a day and it barely gets warm...
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Old 12-15-2002, 09:48 PM   #13
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LOA lites

I wonder about taking the ballast out of the fixture and remote mounting it somewhere? I'm thinking, although I have yet to try one on a tank, that the ballast is responsible for some of the heat you're seeing. I think I'm gonna go with one of the 27w quads on the 10 gal and 2 15w actinics for starters. Also...maybe put a hole in the top of the fixture for heat to escape? Just some thoughts.
As far as the comparison to MH goes... I have never used MH lighting so there is probably no one on earth that knows less about it than I do. But, unless I'm mistaken, the lumen rating has something to do with how bright the light seems to the human eye? Don't believe it is really an accurate measure of intensity and also don't believe the current technology in fluorescent will ever compare to the intensity of MH.
When I set up the 29, I'm thinking about doing a pendant with the 65w LOA bulb and a couple of PC actinics. What do you think about that idea? The pendant, IMO, would mitigate the heat issue since it will be several inches off the tank. Tank will house a dwarf lion and have LR. Ideas?
Logan J
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Old 12-22-2002, 03:21 PM   #14
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Lights

You know, the heat is, probably caused mostly from the trans however, I didn't open it to see where and how big it is....(Not my lamp). Didn't look very big though...Have you seen the one in your light outside? Is it in the base of the bulb?

I thought about 2 of the LOA work lights in my canopy( If I ever get the time to build it) along with two of the 18" Coralife 420 Actnics. I am going to unscrew the fixtures out of the black 24" covers and mount them directly in the new canopy.

I will make chromed reflectors for the LoA lights, or, purchase a retrofit kit reflector for MH.. I want good light disbursment... for less $????

I am thinking of the fan situation and I wonder how quiet you can find them...I want to keep the noise down as much as possible.. Ideas? I know they make some that are pretty quiet for computers however, they are 12volt. I found some at RS and they are loud...My better half is going to shoot me if it gets any louder than it already is...

Tim
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Old 12-22-2002, 03:55 PM   #15
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I've been using LOA Worklights for quite some time now to grow Phytoplankton. The downside is they only last about a year and that's only if you pull the case apart and drill some ventilation holes. The plus side is the price. $25 for a whole lot of light.

I have to disagree with Captain that Lumens = Intensity. They are not even closely related IMO. Intensity = Photons per unit of area. Lumens are only a measure of photons occuring in a very small and specific range of wavelength.
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Old 12-22-2002, 11:56 PM   #16
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Ok Bang,
Just trying to get a handle on some lighting theories. Seems there like certain body parts! HA Just picked up an Icecap 660. Going to put 4 vho in hood and use LOA in sump. Later
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Old 12-23-2002, 09:29 AM   #17
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This has nothing to do with LOA or aquariums but just an observation.

I work with technology on a daily basis and one of those components is LCD projectors. The industry rates their projectors on lumens. So they may say a specific model puts out 1200 lumens.

I have seen MANY times where two different projectors of different models that are supposed to be rated at the same lumens output acutally have very differnt image brightness.

One factor with lumens is how they test. Do they test the lumen output of the bulb at say 5' and if so do they measure it at the brightest spot or do they take an overall average of the entire area lit by the bulb?

You see how ratings things by lumens can be a bit inaccurate.
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Old 12-23-2002, 11:57 AM   #18
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I've seen test LED's that are a mix of blue and red. They are too bright to look at and yet barely register on my Lux meter. Once that technology gets off the ground I believe it will be the future in lighting for us. They put out almost no heat.
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Old 12-24-2002, 12:12 AM   #19
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One question though, that I didn't see an answer too, are these ok for use as a coral light source?
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Old 12-25-2002, 12:39 AM   #20
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HD lights

Not sure on the LED's. Have heard that current technology in these lights didn't have the correct spectrum for aquarium lighting, but I wouldn't consider the source of that info totally reliable.
I tried one of the LOA fixtures on a tank. It was the large floodlight with the 65w bulb. After about 2 weeks, it smoked the bulb. It ran very hot also. I took it apart and the ballast is pretty much attached to the screw in base. I'm sure you could cut some wires and enclose the ballast in a Radio Shack project box though. I think I'll stick with PC's for now...they aren't that much more expensive and, IMO, are more reliable. I may try one of the Commercial Electric screw in bulbs as a refugium light though since they are also 6500k.
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