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Old 08-05-2004, 03:52 PM   #11
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yeah cold cathodes aren't designed to dim really, but an LED can dim. some install a dimmer switch even.
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Old 08-05-2004, 04:23 PM   #12
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you can also use a potentiometer in series with the led's to cause the dimming.
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Old 08-05-2004, 04:38 PM   #13
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would the zalman fanmate be ok though? dusty, any chance you could find a radioshack part number for the pot in case the zalman won't work? thanks
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Old 08-05-2004, 05:02 PM   #14
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I looked at the radio shack website and they did not have anything i would use. Of course the items they actually have at the store may be better. I will see if i can stop by there this evening and get you a number. I got my parts from my lab. As for the LED's I got mine from www.bgmicro.com . You want around 430 nm wavelengths. I have the circuit at home that I modeled my system from if you want to take a look at it.
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Old 08-05-2004, 11:16 PM   #15
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malkore - i may have overlooked it, but what size is that tank? thanks
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Old 08-06-2004, 11:53 AM   #16
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40 gallon breeder: 36"x18"x16"
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Old 08-06-2004, 01:38 PM   #17
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does it look like the LEDs could be changed if need be, maybe to a different color?
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Old 08-07-2004, 03:13 PM   #18
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Catalog #: 271-1716 is the number for a suitable 50k pot. it's a max wattage is a
.5watts so keep that in mind.

Burns to answer you question about the fanMate 1, i don't think it will work. it limits voltages from 12 - 5volts, and blue leds only operate at 4.2 and less. chances are the fan mate will not go low enough to effect the leds, unless you moded the fan mate, by replacing it's pot/rheostat. but to mod it you will need to get a smaller pot, and by then it would be easier to use a stand alone pot in the circuit and skip the fan mate all together.
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Old 08-08-2004, 12:15 AM   #19
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I think this is a great find! I will definatly use it on my tank. I will probably need to use more then 2 units since I have a 125g tank. How far apart was the spacing with the two units you used?

As for dimming them with a fan switch, that sounds like a great idea. Any type of resistor based switch should do the trick. I don't know of LED's to be picky when you cut the power settings down.

As for those that didn't have nice things to say. Hush your mouths. Your mothers raised you better then that.
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Old 08-09-2004, 11:38 AM   #20
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Yes LED's can be dimmed (if you've ever seen an iMac's pulsing apple logo...that's just an LED inside).

There's about 1 foot inbetween the two 'bricks'...and they're maybe 10" in from each end of the tank.
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