Luxeon K2 drop-in bulb for C & D maglites, $24.95 & 140+ lumens

Info here: http://www.luxeon-k2.com/

Re: Luxeon K2 drop-in bulb for C & D maglites, 140+ lumens

I think diamond mentioned these in the dealer's section

Re: Luxeon K2 drop-in bulb for C & D maglites, 140+ lumens

Yes, & i'm pleasantly surprised they are only $24.95: http://www.quality-items-flashlights.com/index.php/cat/c1305_6-5-Watt-Luxeon-K2.html

Re: Luxeon K2 drop-in bulb for C & D maglites, 140+ lumens

Wow, 24.95 sounds great. Hurry, somebody buy one! (and let us know if how much BS-ing is going on with the 140 lumen claim)

Re: Luxeon K2 drop-in bulb for C & D maglites, 140+ lumens

Our NEW Diamond® LED bulb replacements use
the latest U.S.A. technology from Silicon Valley
(Jan 30, 2006) Luxeon K2 LED's which produce
more than 140+ Lumens or 6½ Watts in White!!

Click to expand...

From their page, from the context the 140 lumen number has nothing to do with their product and more to do with respouting lumiled's market speak about idealized K2 specs.

Re: Luxeon K2 drop-in bulb for C & D maglites, 140+ lumens

No Surprises here.. K2 costs $3.5 @ PhotonFanatic

It also depends on the bin:

K2 R bin = 45 lumens
K2 S bin = 80 lumens
K2 U bin = 120 lumens
K2 V bin = 140 lumens

I just barely bought a 3 watt for my mag. I should of waited.....Of course, I wonder how many V bins they have and how many R bins they have.

can someone post the runtime and brightness of the K2 in their M@gs?

john2551 said:

It also depends on the bin:

K2 R bin = 45 lumens
K2 S bin = 80 lumens
K2 U bin = 120 lumens
K2 V bin = 140 lumens

Click to expand...

You need to keep in mind that the die gets very hot, and the lumen numbers drop alot! Someone is just yanking numbers off the datasheet, which is with the die at 25C. It isn't even going to be close to this during operation.

As such, you could easily loose 30% of those lumens, due to the heat
K2 V bin = 140 lumens
Becomes: 98 lumens



(Plus you will loose alot more in the reflector.)

Any way you can get one of these to work in a 2C Maglite?

InfidelCastro said:

Any way you can get one of these to work in a 2C Maglite?

Click to expand...

They state it will work in a 2 cell but *Optimum output with 3 cells

Hmm, thanks I didn't see that. I was looking at these the other day too, but gave up when it said 3 Cell or larger.

I wonder how much of a difference there is. I would think with the red unit there should be no difference. What do red LED's require, like 2.4Vf?

so how are the K2s compared to the 3W? 3W claims 80 lumes IIRC.

I have a K2 V bin proto, 2 actually. It is highly unlikely that they actually have obtaind V bins in sufficient qty to sell a product. That is an understatement.

Do red Lux's use the same Vf as red 5mm LED's?

One thing I wonder is the runtime curve. Flashlightreviews' plot already shows a rapid drop to 50% output for the 3W version (though it holds there till the next millenium). With 6W, full power might only be a few minutes with alkalines.

I wonder if this will work on a 4D nimh Mag; 4.8V is not too far off 4.5V, it should be a tad brighter and give a much flatter curve.

InfidelCastro said:

Any way you can get one of these to work in a 2C Maglite?

Click to expand...

one way is to use a single 18650 (3.6v nominal) together with a dummy 123-cell (Aw sells these in the Dealer's Corner) to take up the slack. I am planning to run it on a single 18650 in my Mag1C fom modamag's recent Mag midification run.

RoyJ said:

One thing I wonder is the runtime curve. Flashlightreviews' plot already shows a rapid drop to 50% output for the 3W version (though it holds there till the next millenium). With 6W, full power might only be a few minutes with alkalines.

I wonder if this will work on a 4D nimh Mag; 4.8V is not too far off 4.5V, it should be a tad brighter and give a much flatter curve.

Click to expand...

Roy,

EXCELLENT OBSERVATION! That sounds like an excellent idea. 4.8v ni-mh under load should easily drop to 4.5v. I hope Steve from DiamondLED reads this & chimes in with his opinion.

John

john2551 said:

It also depends on the bin:

K2 R bin = 45 lumens
K2 S bin = 80 lumens
K2 U bin = 120 lumens
K2 V bin = 140 lumens

Click to expand...

Just reminding you that: "In order to satisfy market requirements, the LUXEON® K2 will be available in two configurations, one tested and binned at 350mA and a second tested and binned at 1000 mA." and if you are using typical luminous flux values it should read:

K2 R bin= 45 lumens
K2 S bin= 60 lumens

K2 U bin= 100 lumens
K2 S bin= 120 lumens

Info found on page 4