fellfrosch
- Sep 21, 2011
- 4
- Joined
- Sep 21, 2011
- Messages
- 4
I'm not sure how to put this all down so if it's a bit jumbled, I apologise.
I want to build a moonlight system for my 55 gallon aquarium.
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It be composed of:
12V 1A wall wart
6 - 5mm blue (470nm) leds at 12,000mcd with 140 degrees viewing angle, 20mA forward dc current at 3.4v
3 - 5mm red (630nm) leds at 13,000mcd with 140 degrees viewing angle, 20mA forward dc current at 2.1v.
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I want the reds to be able to be switched off (Maybe a 3 position switch of blue, red, or both).
Power would be controlled by a digital timer power strip.
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The LED wizard says for running just the blues, id need 2 sets of 3 in a series/parallel setup with 100ohm resistors before each series.
Can i add in the reds into this setup as another series circuit in parallel with the others? If so, how would i calculate the resistors needed (due to the different voltages)? would i need a bigger power supply? Would i be able to use the switch or would that mess up resistance values?
also, could a variable resistor (turn dial) be used with the blue portion so i could dim the lights if they are too bright? would it be used before the other resistors, or instead of, or...?
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I'm betting I'll just have to use 2 wall warts, but figured i should ask the pros. Steve already helped me with one question i had, so thank you to the peeps who can help me with this one.
Also, if your wondering why i chose these leds, I researched everything people were building and selling and these size, viewing angle, and brightness were the best reviewed. Also I want the reds added because I'm growing plants in my tank and have read the red and blue spectrum of light are good for their growth (and can enhance the looks of fish in those colors).
I want to build a moonlight system for my 55 gallon aquarium.
-----------
It be composed of:
12V 1A wall wart
6 - 5mm blue (470nm) leds at 12,000mcd with 140 degrees viewing angle, 20mA forward dc current at 3.4v
3 - 5mm red (630nm) leds at 13,000mcd with 140 degrees viewing angle, 20mA forward dc current at 2.1v.
----------
I want the reds to be able to be switched off (Maybe a 3 position switch of blue, red, or both).
Power would be controlled by a digital timer power strip.
----------
The LED wizard says for running just the blues, id need 2 sets of 3 in a series/parallel setup with 100ohm resistors before each series.
Can i add in the reds into this setup as another series circuit in parallel with the others? If so, how would i calculate the resistors needed (due to the different voltages)? would i need a bigger power supply? Would i be able to use the switch or would that mess up resistance values?
also, could a variable resistor (turn dial) be used with the blue portion so i could dim the lights if they are too bright? would it be used before the other resistors, or instead of, or...?
-----------
I'm betting I'll just have to use 2 wall warts, but figured i should ask the pros. Steve already helped me with one question i had, so thank you to the peeps who can help me with this one.
Also, if your wondering why i chose these leds, I researched everything people were building and selling and these size, viewing angle, and brightness were the best reviewed. Also I want the reds added because I'm growing plants in my tank and have read the red and blue spectrum of light are good for their growth (and can enhance the looks of fish in those colors).