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Originally Posted by troypiggo
1. The 2 outside resistors I was expecting to be the same, but they're not. From my limited understanding of colour coding, one is 22 ohm, and one is 55 ohm (I think they're green, not blue). The middle one is also 22 ohm. How do I figure out which ones to swap?
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White LEDs typically have a higher forward voltage than red LEDs, so, without seeing the circuit, I would say the 56ohm (green and blue
) will be for the red LED.
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2. Assume that to halve the brightness, double the ohms - so 44 ohms etc? How low can you go? Limits?
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No limits when going that way(dimming), yes doubling resistance will halve brightness.
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3. How to identify the white LEDs and which red ones to get?
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Turn it on?
Any red will do. They will be different to the pre-existing red one so grab a hand full of resistor values to play with brightness.
Or, replace all three with red then replace all three resistors with same value.
There are differences in colour in the red LEDs, if you go to Jaycar they should have an LED tester behind the counter and they should be able to demo the various red LEDs for you. Some are more orangey, but from memory(been a while since I managed a store) there was one there that was a very nice deep red.