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4hv.org :: Forums :: General Science and Electronics
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World's brightest flashlight

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GhostNull
Tue Sept 28 2010, 12:56PM
GhostNull Registered Member #2648 Joined: Sun Jan 24 2010, 12:45PM
Location: Australia
Posts: 291
 		Nice video! But I don't really like the idea of hobbyists commercialising. It just give me goose bumps. urgh =S
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lpfthings
Tue Sept 28 2010, 01:00PM
lpfthings Registered Member #1361 Joined: Thu Feb 28 2008, 10:57AM
Location: Cairns, Australia
Posts: 305
 		Hahaha oh god, I just got my learners license, please don't let me see anyone heading towards me with that on!

Although, it'd make for great conversation :)

How do you intend on powering it?
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teravolt
Tue Sept 28 2010, 07:31PM
teravolt Registered Member #195 Joined: Fri Feb 17 2006, 08:27PM
Location: Berkeley, ca.
Posts: 1111
 		nice work have you fired it up yet? Do you plan to have guinnis books of records look at it? You probibly thought about lithium ion. Maby a 4" pvc tube full of them would make a better handel and be lighter for comershal use.
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Tesladownunder
Tue Sept 28 2010, 07:40PM
Tesladownunder Registered Member #10 Joined: Thu Feb 02 2006, 09:45AM
Location: Bunbury, Australia
Posts: 1424
 		Batteries: three 33AH deep cycle batts good for 12.2V 35A dropping to 12.0V at 12 mins. At 70A 11.8V dropping to 11.7A at 6 mins. Need to run 34V at 52 A peak (1.8kW) delivered to LEDs ie need to drop from (12.0 x 3=36) 36V to 34V. 2V drop at 50A is barely enough for heavy duty cabling and some big MOSFET's to do PWM. A lot of care will need to be taken with very low value load equalising resistors. This is all a bit on the edge.

Meters read 55A, 33V and 65 degreesC during a power test


1285702603 10 FT97381 Ledbikebatttest
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Duality
Tue Sept 28 2010, 08:35PM
Duality Registered Member #1951 Joined: Sun Feb 01 2009, 01:59PM
Location:
Posts: 105
 		could it be seen from outer space?
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Adam Munich
Tue Sept 28 2010, 09:01PM
Adam Munich Registered Member #2893 Joined: Tue Jun 01 2010, 09:25PM
Location: Cali-forn. i. a.
Posts: 2242
 		What do you mean by "Going commercial?" Do you plan on selling these? I'm not too sure anybody will buy a $5000 flashlight, even if it is this size.
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GhostNull
Tue Sept 28 2010, 10:59PM
GhostNull Registered Member #2648 Joined: Sun Jan 24 2010, 12:45PM
Location: Australia
Posts: 291
 		If you watched the video then you would know wink

Link2
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Adam Munich
Wed Sept 29 2010, 12:44AM
Adam Munich Registered Member #2893 Joined: Tue Jun 01 2010, 09:25PM
Location: Cali-forn. i. a.
Posts: 2242
 		Ahh, I see, it's an I want to be on TV thing. Makes sense now.

Good luck with the project! Also TDU, have you found any more hidden numbers on these LEDs?

I once again suggest a lithium battery, as they are much lighter and much smaller. That's key in a flashlight, especially of this size. One more note, you may have to get the Australian equivalent of FAA clearance to shine this thing into the air.
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teravolt
Wed Sept 29 2010, 03:01AM
teravolt Registered Member #195 Joined: Fri Feb 17 2006, 08:27PM
Location: Berkeley, ca.
Posts: 1111
 		when do you plan to have it operational and are you going to add a sholder strap for ease of transport
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Steve Conner
Wed Sept 29 2010, 09:45AM
Steve Conner Registered Member #30 Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
Grenadier wrote ...

Ahh, I see, it's an I want to be on TV thing.
An I want to be on TV "Yet Again" thing smile

Peter, PM or e-mail me if you want a hand with the power electronics, in confidence, this project is so crazy that it simply has to succeed smile
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