Hi All,
I recently built my first 2x S2+ triples with KD SST20 MCPCBs and Convoy 5A drivers. On one of them I noticed, when at 1%, 1 emitter is noticeably dimmer than the other 2. My second triple I changed the sense resistor to provide slightly more amps and that one is fine.
Anyone experienced this? Could it be a bad mcpcb, driver/level issue?
Experience like this is why this community rocks. Intrigued by Adair21’s answer, I read around the web to understand better - I didn’t realise there could be so much tolerance in LED forward voltages!
As a result, when in parallel/at the same drive voltage, different currents drawn = different relative brightness. Outside of independent resistors, you’d need to get lucky with matched emitter tolerances or just run above moonlight so that the difference is less noticeable.
Maybe it’s a reflection of the cost of the KD boards?