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Need High Candlepower Beam
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BeeJ
May 14, 2013, 7:31:52 PM5/14/13
to
Suggestions on acquiring or building a High Candlepower Beam
Input: 12VDC
Output: Best I can get.
I have seen some "rated" at 3 million candlepower; is that for real?
Are there any brighter?
Input: 12VDC
Output: Best I can get.
I have seen some "rated" at 3 million candlepower; is that for real?
Are there any brighter?
Jamie
May 14, 2013, 8:09:21 PM5/14/13
to
Jamie
Bill Sloman
May 14, 2013, 9:01:02 PM5/14/13
to
You are thinking of a Xenon short arc lamp. Here's a useful tutorial.
http://zeiss-campus.magnet.fsu.edu/articles/lightsources/xenonarc.html
A 12V DC supply won't hack it. You need a 20 to 30kV spark to start the arc, which initially drops a couple of hundred volts for a few microseconds as it is first sustained as a glow discharge before it gets the tungsten electrodes hot enough for the arc mechanism to take over.
Zeiss's small xenon arcs need 15V at about 5A to sustain the arc. The unit that I built to drive a bigger lamp needed 20V at 22.5A.
The voltage drop across the arc has a weak negative resistance - in that the voltage drops slightly as you increase the current - so you need a power supply that regulates the voltage drop to sustain a constant arc current - think pulse width modulation and a filter inductor.
Protecting the pulse width modulator against the 30kV starting spark takes a bit of care. The Southampton Chemistry electronics workshop apparently built an "improved" version of my power supply after I'd left, with a "better" starter which destroyed all the regulating transistors when they first tried it.
--
Bill Sloman, Sydney
gregz
May 14, 2013, 9:00:27 PM5/14/13
to
million.
How they get their ratings seem to be a mystery. All depends on spot size.
My 500 lumen flashlight is amazingly bright.
Greg
Gib Bogle
May 14, 2013, 9:59:16 PM5/14/13
to
Adrian Jansen
May 15, 2013, 12:18:02 AM5/15/13
to
http://electusdistribution.com.au/productView.asp?ID=13170
or these ?
http://dx.com/p/waterproof-rechargeable-24w-6000k-2000-lumen-hid-white-diving-torch-flashlight-black-129307
--
Regards,
Adrian Jansen adrianjansen at internode dot on dot net
Note reply address is invalid, convert address above to machine form.
dca...@krl.org
May 15, 2013, 8:37:51 AM5/15/13
to
On May 14, 9:01 pm, Bill Sloman <bill.slo...@ieee.org> wrote:
>
> A 12V DC supply won't hack it. You need a 20 to 30kV spark to start the arc, which initially drops a couple of hundred volts for a few microseconds as it is first sustained as a glow discharge before it gets the tungsten electrodes hot enough for the arc mechanism to take over.
>
> --
>
> A 12V DC supply won't hack it. You need a 20 to 30kV spark to start the arc, which initially drops a couple of hundred volts for a few microseconds as it is first sustained as a glow discharge before it gets the tungsten electrodes hot enough for the arc mechanism to take over.
>
> Bill Sloman, Sydney
Look in Ebay for HID Xeon kits for replacing car headlights with Xeon
bulbs. They have ballasts that run on 12 volts and generate the
necessary starting voltage.
Dan
Joerg Niggemeyer
May 15, 2013, 9:04:11 AM5/15/13
to
In message <kmuhhg$ddp$1...@speranza.aioe.org>
The good old spot lights are having good and quite big chrome plated
reflectors, so they collect most of the light of halogen in the spot.
But the lumen wattage performance of halogen is poor compared to
LED or HID. So much brighter lights are not a problem......
The highest intense spot I achieved so far was using
a 2mm long high pressure arc bow with a tube build for 24W DC.
It is running wiht an AC current at 5-6kHz instead to avoid cathode
fall regions.
The reflector is always very important
in combination with the size of the light source itself.
The proper adjustment and mounting is tricky, when smaller diameters
are in use.
One of the best reflectors for a standard D1S or D2S MPXL bulbs you
find for instance at MIL flashlights like http://www.nightreaper.com
The half angle of the beam is very narrow I guess just +-1�
LEDs gives you also impressive spot lights, but only when doing
it right: You can get just
in the center an impressive blue spot, which is just the
blue chip and the yellow of the luminance material is in the outer
ring and you wonder why your several watt LED chip is less good than a
well designed LED from for instance LEDLENSER running at lower power.
rgds
Joerg
--
Nucon Gesellschaft b�rgerlichen Rechts Gesch�ftsf�hrer: Joerg
Niggemeyer & Gert G.Niggemeyer Email: Joerg.Ni...@nucon.de WEB:
http://www.nucon.de
Steinbecker Muehlenweg 95, 21244 Buchholz idN, Germany
UST-IDNR.: DE 231373311, phone: +49 4181 290913, fax: +49 4181 350504
This electronic transmission (and any attached document) may contain
confidential and/or privileged information. It is intended only for
the person or entity to whom it is adressed.
If you are not the intended recipient (or have received this e-mail in
error) please notify the sender and destroy this e-mail or any
attached document immediatly. Any unauthorized copying, disclosure or
distribution of the material in this e-mail is strictly forbidden.
reflectors, so they collect most of the light of halogen in the spot.
But the lumen wattage performance of halogen is poor compared to
LED or HID. So much brighter lights are not a problem......
The highest intense spot I achieved so far was using
a 2mm long high pressure arc bow with a tube build for 24W DC.
It is running wiht an AC current at 5-6kHz instead to avoid cathode
fall regions.
The reflector is always very important
in combination with the size of the light source itself.
The proper adjustment and mounting is tricky, when smaller diameters
are in use.
One of the best reflectors for a standard D1S or D2S MPXL bulbs you
find for instance at MIL flashlights like http://www.nightreaper.com
The half angle of the beam is very narrow I guess just +-1�
LEDs gives you also impressive spot lights, but only when doing
it right: You can get just
in the center an impressive blue spot, which is just the
blue chip and the yellow of the luminance material is in the outer
ring and you wonder why your several watt LED chip is less good than a
well designed LED from for instance LEDLENSER running at lower power.
rgds
Joerg
--
Nucon Gesellschaft b�rgerlichen Rechts Gesch�ftsf�hrer: Joerg
Niggemeyer & Gert G.Niggemeyer Email: Joerg.Ni...@nucon.de WEB:
http://www.nucon.de
Steinbecker Muehlenweg 95, 21244 Buchholz idN, Germany
UST-IDNR.: DE 231373311, phone: +49 4181 290913, fax: +49 4181 350504
This electronic transmission (and any attached document) may contain
confidential and/or privileged information. It is intended only for
the person or entity to whom it is adressed.
If you are not the intended recipient (or have received this e-mail in
error) please notify the sender and destroy this e-mail or any
attached document immediatly. Any unauthorized copying, disclosure or
distribution of the material in this e-mail is strictly forbidden.
Paul Hovnanian P.E.
May 15, 2013, 12:17:03 PM5/15/13
to
use the appropriate step up electronics, triggering supply and ballast.
Your best bet is to Google for an HID handheld spotlight. Or for a rollyour
own, build something around an HID headlight conversion kit.
There are more powerful lamps available that are not suitable for vehicular
use. But given the limited market, they will be more expensive. Your best
bet is to use something built to use a headlight type lamp so replacement
parts will be easily available.
--
Paul Hovnanian mailto:Pa...@Hovnanian.com
------------------------------------------------------------------
RAM disk is *not* an installation procedure.
Jamie
May 15, 2013, 6:01:30 PM5/15/13
to
Jamie
BeeJ
May 15, 2013, 7:52:25 PM5/15/13
to
Adrian Jansen submitted this idea :
$70 is good. $180 shipping is NOT good.
Cannot find a U.S.A source.
> On 15/5/2013 9:31 AM, BeeJ wrote:
>> Suggestions on acquiring or building a High Candlepower Beam
>> Input: 12VDC
>> Output: Best I can get.
>>
>> I have seen some "rated" at 3 million candlepower; is that for real?
>> Are there any brighter?
>>
>>
> You mean like one of these ?
>
> http://electusdistribution.com.au/productView.asp?ID=13170
>
> or these ?
>
> http://dx.com/p/waterproof-rechargeable-24w-6000k-2000-lumen-hid-white-diving-torch-flashlight-black-129307
http://electusdistribution.com.au/productView.asp?ID=13170
>> Suggestions on acquiring or building a High Candlepower Beam
>> Input: 12VDC
>> Output: Best I can get.
>>
>> I have seen some "rated" at 3 million candlepower; is that for real?
>> Are there any brighter?
>>
>>
> You mean like one of these ?
>
> http://electusdistribution.com.au/productView.asp?ID=13170
>
> or these ?
>
> http://dx.com/p/waterproof-rechargeable-24w-6000k-2000-lumen-hid-white-diving-torch-flashlight-black-129307
$70 is good. $180 shipping is NOT good.
Cannot find a U.S.A source.
Jasen Betts
May 16, 2013, 9:02:51 AM5/16/13
to
On 2013-05-15, BeeJ <spa...@nospam.com> wrote:
> http://electusdistribution.com.au/productView.asp?ID=13170
> $70 is good. $180 shipping is NOT good.
> Cannot find a U.S.A source.
If Electus has it try Jaycar, they are the retail arm and have a
> http://electusdistribution.com.au/productView.asp?ID=13170
> $70 is good. $180 shipping is NOT good.
> Cannot find a U.S.A source.
presence in USA.
https://www.jaycar.com/productView.asp?ID=ST3379
says says about $51 shipped to US metro locations. 5-10 days.
$70 seems to be the australian price,
it's even cheaper in UK
in NZ they want crazy mooney.
--
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