Hi:
Using my Xantrex XDL-35-5 precision power supply on an ARC AAA-P of the Nichia CS LED generation:
Volts Amps Watts
0.9 0.060 0.054
1.0 0.071 0.071
1.1 0.078 0.086
1.2 0.109 0.131
1.3 0.183 0.238
1.4 0.259 0.363
1.5 0.293 0.440
1.6 0.276 0.442
1.7 0.265 0.451
It was due to this table that I long ago decided only to use NiMH in the ARC AAA-P. I suppose that an alkaline isn't so bad, since internal cell resistance will limit terminal voltage under load to perhaps <1.4V very quickly. Still, with max power dissipation of the LEDs rated at 120mW (105mW for DS) then even if we assume only 50% conversion efficiency of the booster, we exceed the power rating of the LED with only 1.3V. If the efficiency is nearer to 75%, then the LED is dissipating 2x its rated power between only 1.3 and 1.4V.
No way I'd put a Li AAA in this thing.
Any reason the driver design wasn't made to regulate a stable LED drive current of say, 30mA independent of input voltage?
Using my Xantrex XDL-35-5 precision power supply on an ARC AAA-P of the Nichia CS LED generation:
Volts Amps Watts
0.9 0.060 0.054
1.0 0.071 0.071
1.1 0.078 0.086
1.2 0.109 0.131
1.3 0.183 0.238
1.4 0.259 0.363
1.5 0.293 0.440
1.6 0.276 0.442
1.7 0.265 0.451
It was due to this table that I long ago decided only to use NiMH in the ARC AAA-P. I suppose that an alkaline isn't so bad, since internal cell resistance will limit terminal voltage under load to perhaps <1.4V very quickly. Still, with max power dissipation of the LEDs rated at 120mW (105mW for DS) then even if we assume only 50% conversion efficiency of the booster, we exceed the power rating of the LED with only 1.3V. If the efficiency is nearer to 75%, then the LED is dissipating 2x its rated power between only 1.3 and 1.4V.
No way I'd put a Li AAA in this thing.
Any reason the driver design wasn't made to regulate a stable LED drive current of say, 30mA independent of input voltage?
