Flashlight cree mce design
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spencer
Enlightened
What about three 18650 cells in a wide body? That would be my vote because it is round and not elliptical.
Fallingwater
Flashlight Enthusiast
Three 18650s would probably be better in a triangular body. Easier to grip.
I like it.
There's plenty of 4AA hosts that hold the cells two wide, and they're very comfortable to carry. This wouldn't be much wider, and I'd love to see something like this with a modified McR38 or McR45 (or something of similar quality).
3x18650 in a triangular configuration is fine for occasional use, but I don't care for something that big if I'm going to carry/use it regularly.
There's plenty of 4AA hosts that hold the cells two wide, and they're very comfortable to carry. This wouldn't be much wider, and I'd love to see something like this with a modified McR38 or McR45 (or something of similar quality).
3x18650 in a triangular configuration is fine for occasional use, but I don't care for something that big if I'm going to carry/use it regularly.
PhantomPhoton
Flashlight Enthusiast
Personally I like the 2 18650's side by side the best. Long bodies are found all over the place on cheap junk. Plus the side by side makes it more easily carried.
3 in a triangle wouldn't be bad either but not as nice as 2 side by side.
3 in a triangle wouldn't be bad either but not as nice as 2 side by side.
cheetokhan
Enlightened
Now just move the switch over to the side and it's perfect!
Flashfirstask?later
Enlightened
I would prefer the flat side by side the best for carry unless a 3x18650 triangle had a worthwhile advantage, say in output.
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Bronco
Enlightened
I vote for three in a triangular configuration. More runtime and more surface area for heatsinking.
shomie911
Enlightened
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An other test with 45mm bezel and length ~130 mm :
The 2 x 18650 side by side version looks the best. Seems like it would fit in the hand nicely and it takes only 2 batteries.
Is this light actually going to be produced?
HEY HEY ITS HENDO
Enlightened
neat! 2 side by side is way better than a long body
Jarl
Flashlight Enthusiast
Agreed. The only advantage of a long body is for hitting things, but 2x18650 isn't really long enough for that.
shomie911
Enlightened
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This design opens up the possibility of running two 18650s in parallel for a lot of runtime.
2600 mah + 2600 mah = 5200 mah @ 3.7v
I'm don't really know much about the cree mce but that kind of capacity with an R2 or Q5 would be amazing.
Think 6+ hours of runtime at 250 lumens from an R2.
2600 mah + 2600 mah = 5200 mah @ 3.7v
I'm don't really know much about the cree mce but that kind of capacity with an R2 or Q5 would be amazing.
Think 6+ hours of runtime at 250 lumens from an R2.
Jarl
Flashlight Enthusiast
2x18650 is about 16 watt hours, so you're talking an hour and a half for an MC-E at full pelt. Nice 
MrGman
Flashlight Enthusiast
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I like them both, the 2 side by side and the 3 in a triangular format. The MCE can be configured to put 2 dice in series with 2 in parallel keeping the voltage at around 7.4V and 1.4 Amps total current to run all 4 die at full power.
The 3 battery configuration could be put all in parallel, to run either the MCE with all dice in parallel or the P7 at full power with more than enough current draw to spare at lower voltage. It could come very close to a direct drive unit and hold the output for a very long time and save the power loss of a power conversion drive system. Possibly needing only a 0.2 to 0.3 ohm ballast resistor in the 2 watt range just to keep it safe and be done with it. It should only in reality dissipate no more than 1 watt of power roughly. This could be done for instance by taking say 5 each 1 ohm resistors put them in parallel to make 0.2 ohms. If they were rated at 1/2 watt each the total power dissipation rated would be 2.5 watts. Four resistors would make a 0.25 ohm 2 watt total resistor in parallel. I believe surface mount units could be found to go on a disk to heatsink them to and make that and voila, your done. This is so you don't have one big bulky resistor taking up space that would have to make the unit larger behind the LED head.
When can I put in my order?????? ?? ?? ?? ?
The 3 battery configuration could be put all in parallel, to run either the MCE with all dice in parallel or the P7 at full power with more than enough current draw to spare at lower voltage. It could come very close to a direct drive unit and hold the output for a very long time and save the power loss of a power conversion drive system. Possibly needing only a 0.2 to 0.3 ohm ballast resistor in the 2 watt range just to keep it safe and be done with it. It should only in reality dissipate no more than 1 watt of power roughly. This could be done for instance by taking say 5 each 1 ohm resistors put them in parallel to make 0.2 ohms. If they were rated at 1/2 watt each the total power dissipation rated would be 2.5 watts. Four resistors would make a 0.25 ohm 2 watt total resistor in parallel. I believe surface mount units could be found to go on a disk to heatsink them to and make that and voila, your done. This is so you don't have one big bulky resistor taking up space that would have to make the unit larger behind the LED head.
When can I put in my order?????? ?? ?? ?? ?
