Don't set the voltage and assume the current will be correct, you need to provide a controlled current source, not a voltage source.My design: I was thinking of using 24v to power 7x in series bringing the voltage down to 3.43v on each LED and I think this is fine.
As for the LEDs not being binned I'm just going to have to try. My reasoning was that I will split 48v amongst 14 leds and that should leave them with 3.42857V each which is within the range specified. I was then reasoning that if the recommended current is between 600 and 700mA, then with a 5.6ohm resistor it will allow around 607mA to pass
Added:
If you buy that cheap LEDs ... you need to expect an untypical distribution of the forward voltages.
It's not very unlikely that they sell the rest of LEDs after the binning. If so, then you will not find LEDs with a forward voltage of - let's say - 3.3V up to 3.5V. You may just get LEDs with a forward voltag below 3.3V or above 3.5V.
How do you intend to solder to aluminum?My intention was to solder the LED on top of those aluminum bases
So would you say a constant current circuit would solve the problem of cheap leds?
Ie: A circuit which allows 650mA to pass through to 7 or 14 LEDs in series?
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