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Old 10-30-2003, 12:39 PM   #31
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Kribbz:
Found it a modeling & hobby store, also might be at a craft store like the Michaels chain. I think it was intended for model railroaders to make lakes and rivers with.

Dustybrannum:
Yes you can, that is my current problem!
When I coulden't find the leds here anymore I switched to a cold cathode tube from the computer store, made to light up your PC case, very nice but very bright.
With the dim leds the fish headed off to bed, with the new cold cathode tube they are up all night.

The tank looks very nice lit by the 12 inch cold cathode blue tube though.

Leads to my next question: anyone know if you can safely dim the CC tube by maybe lowering the supply voltage to the balast from "suggested" 12v?
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Old 10-30-2003, 02:01 PM   #32
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I found a really cheap cold cathode tube, 12 inches, blue, but was wondering is that would be too big for my 45 gallon tank.. will it light up too much? thanks!
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Old 10-30-2003, 03:21 PM   #33
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Sounds like the one I have.

I got the Sunbeam 12 inch blue

And it makes my 120 gal quite bright, like early evening,
too bright for fish they wont go to bed. BAD fish
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Old 10-30-2003, 03:38 PM   #34
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whoa wait.. 12 inches does that!? - how many inches should I get for a 45 gallon tank!?
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Old 10-30-2003, 05:57 PM   #35
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I did not think(maybe I am wrong) that the CC lights came in other lengths.

Discussing this same topic on the Cichlid-Forum, I found someone who is running their CC light at 7.5volts and says the output is much better/dimmer.

I am going to try to make it to a radio-shack tonight and get a variable output adapter (they have them that can be set to output from 4.7volts to 12 volts).
And see what can be done using it.
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Old 10-30-2003, 06:27 PM   #36
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hmm.. sounds like a plan I saw those at radio shack today... how easy do you think it would be to hook an adapter to a CC? Would I still have to use the inverter?
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Old 10-30-2003, 06:32 PM   #37
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oh yeah they make 4 inch CC lights too... you think I should get those instead fo a 12 incher.. or maybe I should get the 12 incher and dim it... is it also possible to add on a white cathode tube for the flourecent? Do they use less power too? I never really found out.. I know a lot about LEDs just not about the CC lights
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Old 10-30-2003, 06:54 PM   #38
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so yeah I was thinking of having both cathodes one blue the other white as the light source for both day and night. I think the cool thing would be to put a light sensor in between the inverter for the blue cathode and the tube of the cathode.. so you wouldn't need to put it on a timer, but have the white one on a time, so when it goes of the light sensor activates the blue cathode. what do you think?
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Old 10-31-2003, 01:40 AM   #39
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I got the variable power adapter(3v-12v 800ma) and the CC tube lights up full length at 6v and goes to full intensity at 12v. The guy on Cichlid-forums was right best seems around 7.5v for me as well.

You still need the inverter The CC tubes operate at about 880volts.

I cut the end of a spare pc power connector(I think called molex) and soldered the wires from it to the wire of the new power adapter(I had to cut its end off as well)
Just make sure you have the polarity right before soldering :P
Then just pluged the CC inverter into it.

The inverter that comes with the sunbeam kit can power up to 2 CC tubes.
Not sure if 1 white CC would be enough for a tank light but maybe without plants it would do. I suspect an inverter with 2 white tubes would be more than enough light for a plantless tank.
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Old 10-31-2003, 02:05 AM   #40
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yeah my tank will only have java ferns.. no real light needed.. but yeah the white tube should be powerful enough at 12 inches, for a 36 inch long tank (45 gallons). I ordered one blue tube kit which comes with a dual inverter, so I will attach a white cathode onto it. I will also get an adapter which will be variable. I am definately going to put a timer on the white cathode wires and a light detector on the blue cathode to have an automatic moon light when the white cathode goes out.
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