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#298504 - 03/02/21 01:04 PM Re: Light output relative to weight of headlamps [Re: hikermor]
chaosmagnet Offline
Sheriff
Carpal Tunnel

Registered: 12/03/09
Posts: 3545
Loc: USA
Originally Posted By: hikermor
Great suggestion. What is it and where do I find it?


Nitecore makes the NU25, it’s available on the Big River for under $40. I don’t own one. I have an NU20 which is great for carrying something quite small (it lives in my laptop bag). I also have an NU30 (discontinued and replaced with the NU32), which I use primarily for night shoots on the outdoor range.

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#298505 - 03/02/21 01:46 PM Re: Light output relative to weight of headlamps [Re: chaosmagnet]
hikermor Offline
Geezer in Chief
Geezer

Registered: 08/26/06
Posts: 7507
Loc: southern Cal
Thanks. Checked it out. it is another example of the increase in illumination relative to weight that seems typical of lithium ion batteries.

As automakers turn to electric, I wonder what technological advances will increase lighting efficiency even further....
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Geezer in Chief

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#298507 - 03/02/21 03:28 PM Re: Light output relative to weight of headlamps [Re: Phaedrus]
haertig Online   content
Pooh-Bah

Registered: 03/13/05
Posts: 2270
Loc: Colorado
Originally Posted By: Phaedrus
FWIW, I'm not sure the lumen rating really says much. The figure given is often "goosed" a bit by the marketing dept.

That's why, when considering a light, the first thing you should ask is, "Is that rating in normal lumens, or Chinese lumens?"

Similarly, when considering a generator, ask if it's rated in "normal watts or Chinese watts".

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#298508 - 03/02/21 04:53 PM Re: Light output relative to weight of headlamps [Re: hikermor]
Ren Offline
Enthusiast

Registered: 11/05/07
Posts: 321
Loc: Wales, UK
High end automakers (BMW, Audi) have been using LEP (laser excited phosphor) lights as opposed to LED for a while in some models.

There's probably a dozen or more flashlights using the technology so far.
Most of the single cell (18650 or 21700) LEP lights produced around 500 lumens, but the candela ranges from 200,000 to 1,700,000.
The current champ is the Weltool W4

https://www.weltool.com/page137?product_id=148

And Acebeam recently announced a 8x18650 light. 1400 lumens, 3,970,000 candela

https://acebeam.com/white-laser-lights-w50

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#298509 - 03/02/21 10:13 PM Re: Light output relative to weight of headlamps [Re: roberttheiii]
roberttheiii Offline
Enthusiast

Registered: 02/13/09
Posts: 350
Loc: Connecticut, USA

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#298512 - 03/03/21 02:40 AM Re: Light output relative to weight of headlamps [Re: hikermor]
Phaedrus Online   content
Carpal Tunnel

Registered: 04/28/10
Posts: 2892
Loc: Big Sky Country
Those LEP lights are definitely the kings of throw! I am thinking of picking up a JETBeam LEP, just not sure how useful it would be for day to day stuff.
_________________________
“I'd rather have questions that cannot be answered than answers that can't be questioned.” —Richard Feynman

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#298526 - 03/04/21 02:54 AM Re: Light output relative to weight of headlamps [Re: Phaedrus]
gulliamo Offline
Member

Registered: 09/11/02
Posts: 181
Loc: Denver, CO, USA
I have 1/2 dozen or so NU25s. I use them for backpacking, car kits, jogging, BOBs, etc. They weigh less than an ounce, last forever, are incredible bright, and recharge quickly from a USB power pack.

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