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I'm afraid to ask this at CPF...

rhd

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I would be really interested to see if anyone would trade a powerful flashlight, for a 445nm laser.

I'd love to own a super bright SST-50 or SST-90 torch, and I'm sure even that cutting edge emitter in a torch would be on par with a 445nm laser value-wise.

Would be kinda cool to do an exchange with someone who knew torches - just putting that out there. I'm semi-terrified of asking at CPL ;)
 





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They should be know the price.
the Jetbeam (same brand I think that jet laser) rrt-3 has an SST-50, and it is beautiful flashlight. cost 320$ for one.
wich drive for your 445 and wich host?
I can ask on french forum for you: :beer:
LoupiotesAddict
 

rhd

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In my head I was thinking:

SST-90 LED emitter (around $35) run by 2x 18650 in series, direct driven, should be under the max current capabilities of the LED.

So SST-90 LED + Host should be roughly the same as 445nm LD + host + driver.

In fact, the torch should be a bit cheaper.
 

HIMNL9

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As far as i remember, DX had some torches "rated" 1000 and 1200 lumen, powered from an 18650 battery, but i doubt about the effective level of these units ..... and anyway they was still around 30$ .....
 

rhd

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The SST-90 can handle up to 9A, and has a max V at that of around 3.8.

My thinking is that a cheap and dirty parallel 18650 build direct driver to the led diode, with maybe a cap in parallel, should produce pretty damn bright > 1500 lm.
 

Toke

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As far as i remember, DX had some torches "rated" 1000 and 1200 lumen, powered from an 18650 battery, but i doubt about the effective level of these units ..... and anyway they was still around 30$ .....

The unknown part for me is what kind of driver is used for 5-9A at Vf of 3.6V?
Apart from that the flashlight should be cheaper than the 445nm.
 

Toke

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The SST-90 can handle up to 9A, and has a max V at that of around 3.8.

My thinking is that a cheap and dirty parallel 18650 build direct driver to the led diode, with maybe a cap in parallel, should produce pretty damn bright > 1500 lm.

Good thinking. :)
The light in the back pocket of my overall right now have a low end 18650 driving a sst-90 at app. 3.5A.
 

rhd

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You know - maybe I'll just undertake this myself. The toughest part will be figuring out how to parallel a 2x 18650 host (or which host to go with).

I have a few XM-L emitters here, and I've totally failed at fixing them to their emitter boards. I'm sure that if I purchased an SST-90 emitter already on a board, there would be little issue with the build.

It's too bad we don't have "slightly lower" LDO ICs. With an LT1083, it would be really easy to create a DDL driver for 7.5A driving of an SST-90. The terminal flaw would be that at 1V dropout, a single cell still couldn't drive an LED at ~3.6 Vf.

Are there ULTRA Low Dropout Regulators ? :)
 

Toke

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DX does have buck drivers for sst-50 and sst-90 at respectively 8.2 and 12V input voltage and 5A and 6A output current.
They also sell the diodes, $35 for a sst-90.
(Last september I got one for $21 from 4seven, now out of stock, not restocked.)

There is a link at CPF to a guy in germany who sells buck drivers set at 9A for £35.

Am I reading that regulator wrong, it looks like 3.3V max?

(You could also go for this one. Amazon.com: Stanley HID0109 HID Spotlight: Home Improvement It had a great review at CPF.)
 
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HIMNL9

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Found them.

$29.10 - UltraFire TH-T60 HA-II XM-LT60 5-Mode 1200-Lumen White LED Flashlight with Strap (1 x 18650) - 18650 Cree Flashlights

$28.20 - UltraFire TH-T60 HA-II XM-LT60 2-Mode 1000-Lumen White LED Flashlight with Strap (1 x 18650) - 18650 Cree Flashlights

But now, reading the specifications, my doubts just rised more ..... both of them uses a single 18650 battery ..... "1000 lumen" one, 2500mA driver, 90 min authonomy ? ..... "1200 lumen" one, 3000mA driver, 2 hours authonomy ? ..... both of them uses "XM-LT60" emitter, rated 280 lumen at 700mA (100% working level ..... true, cree states 910 lumen at 3000mA, but that is 325% working field ..... how much minutes they work at that level, before *POOF* ? :p :D)



EDIT: this one, with 5 emitters and 2 or 3 batteries, looks a little bit more "realistic" :p

http://www.dealextreme.com/p/trustf...e-memory-led-flashlight-2-18650-3-18650-30683



EDIT2: Toke, do you mean this one, from DX ?

http://www.dealextreme.com/p/trustf...d-flashlight-with-batteries-set-3-18650-47754

Not exactly "cheap" imho ..... :p
 
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rhd

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Toke: It looks to me like it will do up to 5V out.
Embarassingly basic question - Does a "buck" driver (as opposed to a linear driver) actually convert the excess voltage into current? IE- if I wired 2 cells in series (higher voltage, same current) a buck driver could turn that into lower voltage, higher current? If that's NOT the case, then I'd think using two series cells would be a total waste?
 

rhd

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HIMNL9:
The XM-L is an awesome emitter, but it's maximum current is 3A, vs the SST-90's 9A :)

For me, a single SST-90 would probably be a more practical build than a 5-XML setup.
 

HIMNL9

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I'm wondering if we may even see a torch using the CSM360 emitter, then ..... 6000 lumen at 6.3A must not be so bad, in a handheld case (the only problem may be find a battery powered 16.8V 6.3A driver :p :D)
 




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