What bulb for 2S Li-ion in a MagCharger?

Chicken Drumstick

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Looking for suggestions on which bulb to try in my MagCharger.

Setups I've tried thus far:

Stock bulb on 6 x AA Eneloop. - Love the performance and throw. Would like longer runtimes and keen to what you can get beyond the stock bulb.

Stock bulb on 2 x LifePo4 - Nice and a good all round setup and step up from stock MC performance using the original NiCd or Nimh 6v pack. But less bright than the 6AA Eneloops (only 6.4v vs 7.2v I guess...)

Phillips 5761 on 6 x AA Eneloop - Was ok but very short run times

Phillips 5761 on 2 x LifePo4 - Nicer than I thought it would be. Less throw than the stock bulb but quite a bit more lumen output.


Thinking I'd quite like to try 2 x Li-ion next. But reading on here the stock bulb insta flashes at 8.3v, so 8.4v static voltage of 2xLi-ion sounds like a no no. I also read that the 5761 won't like 2S either.

Any suggestions?
 

fivemega

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You can try 2x26650 with spacer and centering tube with WA1274 bulb.

Brighter than stock bulb and longer run time than stock battery.
Stock bulb is 6V, 1.7A ---
1274 is 7.2V, 2.7A
Stock battery is 6V, 2500mAh --- 2x26650 is 7.4V, 5200mAh
 
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Chicken Drumstick

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You can try 2x26650 with spacer and centering tube with WA1274 bulb.

Brighter than stock bulb and longer run time than stock battery.
Stock bulb is 6V, 1.7A ---
1274 is 7.2V, 2.7A
Stock battery is 6V, 2500mAh --- 2x26650 is 7.4V, 5200mAh
Thanks. Any suggestion on how to find such bulbs? Google doesn't show up much?

Screenshot 2022-11-11 at 12.27.53 am.png
 

Chicken Drumstick

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You can try 20W Philips 7388 (or alternatively Osram 64250) or 10W Osram 64410 Halostar. They make 64410 with vertical filaments so the throw is quite good.
Thanks. I think it was your thread that 2S Li-ion was insta-flashing the 7388. Did you solve this? Do you know if the Osram bulbs handle 2S?
 

Olumin

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The 10W bulb handles them just fine. For the 20 & 30W bulbs I needed to install a NTC (resistor) into the tailcap. You have to insulate the bare metal where the spring clips into the tailcap & strip another part (say, the bottom-inside) of its anodization. Then solder one end of the NTC to the spring & the other to a bare metal surface (of the tailcap). I used "Epcos B57237-S109-M".
 
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