I am in the process of building an LED array to light my saltwater aquarium. I have viewed a number of circuits online and have tried to combine various elements, but although I can follow a schematic well, I struggle with the design side !
My psu is 12V, 20A (cctv psu) and the LEDs are 18 x white Seoul P7's (3.6 Vf, 2.8A, 700-900 lumens)
I tried to calculate the sensing resistor from one website : 0.55/2.8 = 0.20 ohm ; power is 0.25/0.2 = 1.25W but when using : http://home.cogeco.ca/~rpaisley4/LEDcalc.html it gives a 0.43ohm, 3.5W resistor...this is where I'm a bit shakey.
If you have the time I would be grateful if you could check the components and the design.
I would also like to add a 9 LED array using royal blue K2 stars (3.85Vf, 1A, 27 lumens) which ideally would run from the same power supply but have a separate dimmer control. How could this be integrated into the circuit ?
Thanks so much for your assistance - I'm looking forward to learning from you !
My psu is 12V, 20A (cctv psu) and the LEDs are 18 x white Seoul P7's (3.6 Vf, 2.8A, 700-900 lumens)
I tried to calculate the sensing resistor from one website : 0.55/2.8 = 0.20 ohm ; power is 0.25/0.2 = 1.25W but when using : http://home.cogeco.ca/~rpaisley4/LEDcalc.html it gives a 0.43ohm, 3.5W resistor...this is where I'm a bit shakey.
If you have the time I would be grateful if you could check the components and the design.
I would also like to add a 9 LED array using royal blue K2 stars (3.85Vf, 1A, 27 lumens) which ideally would run from the same power supply but have a separate dimmer control. How could this be integrated into the circuit ?
Thanks so much for your assistance - I'm looking forward to learning from you !
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