Last week, I thought to myself: "I don't have enought projects going on already, so lets order some LEDs."
I got 3 for $10 online with free shipping. These are the lower output Crees, binned at p4, which is much lower output than the q5's (about ~25%)
Currently, these are being driving at 700mA, 70% of it potential brightness. If this driver can remain as efficient as it is now, there is a large cost saving potential as the circuit costs $1 to drive 6 LEDs vs $20 for those same six.
The circuit
The setup
The current setting resistor
What that resistor would look like if I had the right one on hand
Emitter
Output