Phillips 5761 in M6

[fivemega]

The previous posts mention that the Philips 5761 draws 5.4A and it will not work correctly with protected 18650.

All incandescent bulbs have higher initial spike which can be 2 or 3 times (depending on recalculated bulb life) of continuous draw which is about 15 Amps.
As of today, I haven't seen any protected 18650 to support this kind of initial spike. PCB simply shuts down the circuit to protect battery.
PCB of AW's 25530 protected cells was strong enough to work with Philips 5761 with single click but they are discontinued.
Solution is either pair of IMR 18650 or 2S/2P 18500 18650 system to share load of total spike.

 

[Daniel_sk]

Thank you fivemega, you replies are always very valuable. It's a shame that regular 18650 won't work. IMR without soft-start will probably have a high chance of insta-flash. Soft-start solution for M6 are rare, expensive and add a lot of complexity. Is there maybe another high output bipin bulb that is widely available and cheap? (TAD is selling 400+ lumen 20W bulbs for 3.8$, I wonder how it would compare to WA1111 or similar).

 

[fivemega]

If you can obtain a proper extension and spacer, pair of protected Keeppower 26650 will power up Philips 5761 with double click.

 

[mamelo]

If you can obtain a proper extension and spacer, pair of protected Keeppower 26650 will power up Philips 5761 with double click.

Off topic (no M6) but as there are not many threads about the 6V Philips 5761... I do have a FM 3x26500 tube and FM "Bi-Pin Socket For MN Lamp Assembly" running 5761 in KT2 turbo head powered by 2x A123 ANR26650 2000mAh LiFePo4 cells (3.3V nominal), recent batches of this cell have higher capacity. Output and runtime might be less than with usual LiOn cells but bulb life should be extended.
EDIT: However, the A123 seem to be not much worse according to http://www.candlepowerforums.com/vb...th-2x-Emolis&p=2296812&viewfull=1#post2296812

I use the longer FM 3x26500 tube with a custom made aluminum spacer from a local shop only because FM 2x26650 tubes were already out at that time.

I am very pleased with the beam quality, tight hotspot and nice spill, great tint. Admitted, it is not used very often - it's rather a fun light for some special moments of nostalgia...

Ah, the cells are high drain and unprotected and power up the bulb with one click flawlessly... :thumbsup:

 

[vicv]

The only problem is finding the bulb in Canada is tough. That being said the Philips 7388 serves me very well. Usually it's the 7387 I choose. 7-800 lumens is just more than necessary in almost every situation

 

[mamelo]

The only problem is finding the bulb in Canada is tough. That being said the Philips 7388 serves me very well. Usually it's the 7387 I choose. 7-800 lumens is just more than necessary in almost every situation

What I like with the 5761 is the filament size (approx 1.6mm x 1.6mm) which I think is responsible for the symetrical tight hotspot, I wish there were a 20W equivalent available for longer runtime. I've just ordered a few, the retailer tags them as EOL but also offers a no-brand replacement which I'll also try, as well as my first 7387. Need to see if the bulbs (as well as the Philips 5761 production batch) actually fits through the KT2 hole. Btw, this retailer also ships to Canada but the shipment is not really cheap (45 EUR)).


EDIT: Could I put a resitor in series to reduce voltage and would this yield to less amps and hence longer runtime? I could then safely use 2x 26550 5000mAh LiOns (instead of my A123 LiFePos) without NTC or softstart?