Correct me if i am wrong..
heres what i posted earlier.. on a resembling thread which i would like to simplify their differences, here ...
http://laserpointerforums.com/f50/hotlight-lpc-826-550ma-380mw-65365.html#post1013608
I have been experimenting with GSA-H55N sleds, they are by far the best ones that can be extracted from the DVD's, It is a mitsubi$hi diode AFAIK LPC-815.. I have One running at 400mA, Other ones at 480mA, and 600mA..
I made the 600mA one in the Copper-core cpu heatsink just a couple of days ago and it has an amazing beam with just a regular acrylic lens..4 Minutes in the run time and the copper core temperature increase from 70F(ambient) to 80F.
Now, I heard last year some Polish members of our forum were running them at 600mA too and they worked nice and strong when properly heatsinked , and upto 750mA they tend to live but for a short time..
Other ones LPC-826's which are a "tiny bit" more efficient with optical output of not more than 20~25mW than LPC-815's on the average.. Which is not much when you compare the beams & burning power.. but on the LPM side the LPC-826 wins by 20~25mW's.
Since the LPC-826's tend to live for a short period at 550mA so rather kept safe at 420mA like LPC-815's, and LPC-815's for longer period at 600mA with "same" Optical Output, I think there is a general misunderstanding of these and practically there is "NO" difference but the only difference there is , is Technically/Theoretically..
And LPC-836's are definitely not as much powerful too
http://laserpointerforums.com/f50/lpc-836-some-results-68104.html, SO, More or less they all are same, The only difference which could be possible is because of LPC-826's being new and unused hence efficient "a tiny bit more"
LPC-836's just a new market name with no serious improvements.
We can say 400mW red is here ..but running them at 650mA as im doing is simply an overkill..