A simple solution to 3xIMR+LF1000 Overheating

[Nite]

I ran a LF 1000 Lumen IMR Tubrbohead lamp, IMR-M6 - 10.8V, 3A, 25 hours life, 3350K continuously over ten minutes without a failure, off 3x16340 cells even though the head and body were very hot.

I made one simple change to my 3x setup to prevent an overheat of the cells. My first Cell next to the lamp was a dummy AW CR123 spacer. Of course I had to use a 2x18650 body instead of a 2x18500.

I use this for all my 3xIMR Ultra super extreme high output lamps, like 1185 etc.

I used my non contact IR thermometer for some readings and no cells went near 60C as the first dummy cell reached about 38C just as a heat sink for the lamp..if this heat had been added to cell number one and cell 1 was an IMR cell it would've been destroyed as they heated to about 40-45C

I urge people to use caution when playing with IMR cells and the new lamps. Especially newbs like me.

 

[neoseikan]

Good job. I think with 2*18650, you got a lower voltage than 3 cells, and then reduced the power to lamp. So less heat was produced.

 

[Nite]

Good job. I think with 2*18650, you got a lower voltage than 3 cells, and then reduced the power to lamp. So less heat was produced.

you mean i had more resistance? I used three cells.

 

[mudman cj]

Nice idea Nite. :thumbsup: Now these can be used for more than just show off bursts without worrying so much about a Li-ion cell going .

 

[boost_guy]

Good job. I think with 2*18650, you got a lower voltage than 3 cells, and then reduced the power to lamp. So less heat was produced.

He used a 2*18650 body with a dummy cell and 3 16340 IMR cells, as an alternative to a 2*18500 body and no dummy cell. The dummy cell is being used as a heatsink.

 

[neoseikan]

He used a 2*18650 body with a dummy cell and 3 16340 IMR cells, as an alternative to a 2*18500 body and no dummy cell. The dummy cell is being used as a heatsink.

Sorry, still 3 cells then. My wrong.

 

[Nite]

Sorry, still 3 cells then. My wrong.

I also made an error, IMR-M6 - 10.8V, 3A, 25 hours life, 3350K

not M3T, works for both though

 

[Illum]

any considerable increase in output?
I'm not sure if I want to trade the extra heat for marginal increase in output ...especially considering my current setup [3x17670 + WA1185] is holding itself together nicely, with the exception that the 1185 is somewhat brutal to the 17670s:candle: