Power tools Li-ion batterie pack to use with 64657 in a Blitz

[Luminous]

I am plaining to modify a Blitz to run a Osram 250W bulb (64657). I would like to use a Milwaukee 28V Li-ion batterie pack and the 28V torch handle to fit onto the Blitz reflector.
I like the idea of keeping the batterie pack as it is and having the convenience of the rapid charger.
Has anybody used this batterie pack before for a torch project?
I have read that it uses emoli cell which I think can easily handle the load but is there any protection circuit built into the pack preventing high drain? Any other reasons why this should not work without modifiying the pack?
If so is there any other power tool batterie pack I could use?

 

[mdocod]

IMO:

go with a 64663 and a Dewalt 36V pack... hehe... (400W)..

(I'm not sure if that bulb will fit or not so double check if you do look into this concept)

 

[Luminous]

I thought about using the 400W 64663 but at 36V it is not overdriven hence less efficient than the 250W 64657 overdriven. Accroding to Luxluthor descructive bulb testing the 250W 64657 overdriven at 28.2V(the Milwaukee pack is in reality a 28.8V pack) should produce about 14000L while the 400W 64663 should produce 16000L (from Osram data sheet).
The Dewalt pack is only 2.2Ah as well, the Milwaukee 3Ah.
In theory with the:
- Dewalt pack I would get 11.9minutes runtime and 16000L.
- Milwaukee pack I would get 15.7minutes runtime and approx. 14000L.
I prefer the extra runtime Vs a bit more brightness.
Also I think I may get a bit more throw as I would think the 64657 would have a smaller filament?
I discovered another option for a 28V battery pack: It looks like Panasonic make one too. Does anybody know what cell Panasonic is using?
Does anybody knows about a Li-ion 39-42V batterie pack? That would be a good option to drive the 64663.

Does anybody know what is the maximun bulb power that can be run (for about 10-15min) in a Blitz without domaging it?

 

[mdocod]

I was thinking in terms of tradeoffs-

I figure with the LiMn pack, you'll get higher efficiency and runtime as you say, but with the A123 pack, you'll get longer bulb life and cycle life...

Either way it would be really cool... IIRC though, neither the 28V or 36V packs on the market actually deliver that into high loads, so the overdriven 64657 might be the better match-up as you are pretty well guaranteed to stay at or over the 24V.

Should be a really fun light when it's all setup no matter how you decide to do it though

Eric

 

[Luminous]

I was thinking of may be another option but i am not sure if I can find a bulb that would do it.
I was thinking of overdriving a long life (2000h-4000h) 250W 24V bulb with a 36V batterie pack. But I am not sure where to find such a bulb?
It looks like Osram make one but it has an axial filament which I do not like. Does anybody knows of any other bulb with an transversal filament?
This set up would give more lumens than the 64657 even probably more than the 64663.
Also Bosch make a 36V batterie pack with 2.6Ah capacity. This would make the runtime a bit better than with the Dewalt pack.

 

[mdocod]

I was thinking of may be another option but i am not sure if I can find a bulb that would do it.
I was thinking of overdriving a long life (2000h-4000h) 250W 24V bulb with a 36V batterie pack. But I am not sure where to find such a bulb?
It looks like Osram make one but it has an axial filament which I do not like. Does anybody knows of any other bulb with an transversal filament?
This set up would give more lumens than the 64657 even probably more than the 64663.
Also Bosch makes a 36V batterie pack with a 2.6Ah capacity. This would make the runtime a bit better than with the Dewalt pack.

Overdriving long-life bulbs can be fun, but each long-life bulb seems to have different over-driving requirements. I have seen 12V bulbs rated 2000 hours that get right up and go great at ~15V, while others are still just waking up at that voltage, and need 22V to be worth overdriving.

I honestly don't know if such a bulb exists anyways... but one thing I have found over the years in playing with bulb overdriving is that, the carefully selected fill gases chosen for a bulb, are actually probably chosen based on the drive level and temperature that the bulb is expected to be run at. A bulb designed to run at such a temperature for 4000 hours, that is being overdriven to the tune of a ~10-15 hours life, will start to leave deposits on the glass, and loose a lot of output in the first few hours of operation. A bulb with a 50-500 hour rated life, driven to that same 10-15 hours of target life for a nice bright incan setup, will behave a lot better. With the fill gases selected to work at higher drive levels, the bulb glass stays clearer longer.

Eric

 

[Luminous]

Thanks for the tip. I also noticed that some bulbs tend to get a black deposit fairly quickly but I assciated it with poor bulb quality rather than overdriven long life bulbs.

 

[Lumencraft (Matt)]

What is this "Blits" reflector? I am interested to see how it will hold up to the heat. I ran my osram 644623 for about 10-11 minutes strait one time and scorched a nice reflector beyond repair

 

[Luminous]

The Blitz is made by Light Force an Autralian company I believe. It is made of Plastic.
So far it has coped with my 7 minutes tests: no domage at all. However I had a seeline fan on during the test to have a bit of air flow in the room.
http://www.lightforce.net.au/images/HANDHELD.pdf