what about amperage though?
It’s still the same power (watts) total, it just depends how you’re delivering it.
If the emitters are in series, they split the voltage from the batteries and the amperage stays the same.
9v*3amps from each battery = 3v to each emitter * 3amps = 9watts (to each emitter)
If the emitters are in parallel, they split the amperage from the batteries and the voltage stays the same.
3v*9amps from the one battery = 3v * 3amps to each emitter = 9watts (to each emitter)
It just comes down to if you would rather power your triple with 1x18650, or with 3x18350. Output/efficiency should be equal.
At that host size you’re going to run into compromises. 3P LEDs from a single 18650 can draw more amps than a p60 head can sink the heat from but short bright bursts are fine. Likely in the 8-10 A range depending on the cell. 3S 18350’s will be easier on springs and switches at 3A per but will add to the length without adding run time. Hard to say exactly what the difference in output would be though.
if i was gonna do 3s cells and emitters i would get a copper p60 triple shell. and that makes sense now. about the amperage and voltage.
Even with a copper shell, A P60 won’t last that long at 27watts. The copper will soak up the heat for a short time, but there isn’t enough surface area on the host to get rid of it.
true. i was not thinking about wattage