I am looking to see if I am the only one who has experienced this issue. I have 2 LF2XTs. I moded the LED in the first one to a Nichia 219 HiCRI led and it has been working fine on both NiMH and 10440 LiIons.
The problem occured when I modded the other one to a XP-G led. It appeared to be working fine on NiMH cells, but the runtime was notably shorter than that of the Nichia. Also, the ODP protection on high would start flashing the LED periodically even after just 5-10 minutes of runtime. When running it on a 10440 all seemed well until I went to high. On 10440 High the body of the light got too hot to barely touch in about 10 seconds. Thinking maybe seomthing was wrong with the LED I proceeded to try two more XP-Gs with the same results.
Moving on to some tests with an ammeter I found that with 10440 on high the Nichia would peak at about 700-750mA. The XP-G would start at around 900mA and then climb very quickly up to 1A then 1.1A than 1.2A at which point the pill got to hot to hold.
Thinking that there may have been an issue with just that driver I swapped the drivers between the Nichia and XP-G. The results were the same which leads to the questions as to why:
- Why does the light run proper on 10440 with the stock XP-E and Nichia while XP-G produces very high current?
- Do the 10440 and Nichia have a lower Vf than the XP-G? Could a lower Vf cause that much a dramatic difference in current draw?
- Is it possible that to produce the Vf and current to draw the XP-G on high the LF2XT driver just couldn't push the required total power?
- I have read a few threads of what claim to be successful XP-G mods to LF2XTs, have any of these mod owners experienced a similar issue? Or, have they even run the lights on 10440 at these levels to test them out?
Thanks in advance for any helpful thoughts.