Actually, those are current sensing resistors, not current limiting.
The voltage across the resistor is compared with a fixed reference
voltage, and it is the FET which limits the current. So, a higher
resistor does not necessarily mean lower current.

Rob Turk wrote:
"Andrew Sarangan" wrote in message
oups.com...
Recently I designed and built a nav light system for my Europa aircraft
using the Luxeon LEDs with great results.

I also measured the radiation pattern (after fitting the LEDs to the
aircraft) and compared it to the FAR specs. It exceeds the requirements
by 3-5 times, and draw only 2 Amps total. It is bright enough to almost
use as a landing light.


Splendit! Great work, Andrew!

One note... When looking at the schematics it appears you're building two
current sources. Without digging too deep it seems the serial resistors are
switched between the two drawings (0.69 Ohm for 1400mA, 1.3 Ohm for 700mA)??

Rob