matt151617
Well-known member
I am converting a set of flush-mount LED deck lights from solar power to plug-in power. There are 6 lights total and each light has 2 LEDs in it. The solar panel had 3 AA rechargeable batteries in it, so I bought a 4.5v 1000mah power adapter. This will turn on 4 of the lights but not all 6, so I suspect the power adapter isn't strong enough. The back of the solar panel/circuitry states "(2) LED Light 3.6V-0.95W".
I am thinking a 5v 2000mah power adapter would provide enough power, but how to I figure out the resistor size so I'm not blasting these lights with too much power? A standard LED calculator doesn't work- assuming 3.6v voltage drop per light I'd need 14.4v just to light up 4 of them- and they worked fine with 4.5v. All 6 worked fine with 3 AA batteries (4.5v).
I am thinking a 5v 2000mah power adapter would provide enough power, but how to I figure out the resistor size so I'm not blasting these lights with too much power? A standard LED calculator doesn't work- assuming 3.6v voltage drop per light I'd need 14.4v just to light up 4 of them- and they worked fine with 4.5v. All 6 worked fine with 3 AA batteries (4.5v).