FENIX LD20 XM-L RUMOR!

I saw this post at flashlight forums it looks interesting 330 LUMENS! Anyone know anything about the XM-L LD20?

http://flashlight-forums.com/index.php?topic=9164.0

As rumors go, that's a pretty good one; now where's the LD10 XM-L rumor..

StarHalo said:

As rumors go, that's a pretty good one; now where's the LD10 XM-L rumor..

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Don't toy with me!

How much current does the XML need to emit 330L OTF? Figure ~350 bulb lumens ~ 330 OTF lumens. Can Alkaline AAs keep up with this kind of current draw?

kramer5150 said:

How much current does the XML need to emit 330L OTF? Figure ~350 bulb lumens ~ 330 OTF lumens. Can Alkaline AAs keep up with this kind of current draw?

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You can work it out roughly using this:
http://www.cree.com/products/pdf/XLampXM-L.pdf

Rough estimates without using a calculator:
A T6 binned emitter,
@700 mA puts out 280 emitter lumens.
350 emitter lumens is, what, 125% of that,
Using the "RELATIVE FLUX VS. CURRENT" chart, 125% output comes in at 900mA.
So I guess Alkalines could keep up at a 350 emitter lumen output, but I always use NiMHs anyway.

Edit, this is calculated just using direct drive. The Fenix would be current stabilised output, so the current draw would depend on the voltage of the cells, and it would depend on how they design the circuitry.

I want one!! Hope the rumor comes true.

lets see -If it's coming, I'll take one

Just emailed Fenix about this. Lets see what they answer.

That would be awesome. If there will be an LD10 XM-L I will get one, that's gonna be really bright on 14500.

An XML in that tiny head would have no hotspot at all. It would be a pretty useless light IMO.

How about a Limited Edition LD10 with a XML-U ? Now that would be something.

kj2 said:

lets see -If it's coming, I'll take one

Just emailed Fenix about this. Lets see what they answer.

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Let us know what they say.

SantaClawz said:

Let us know what they say.

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I will

tre said:

An XML in that tint head would have no hotspot at all. It would be a pretty useless light IMO.

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Not everyone needs throw.

They might be releasing an updated LD/PD line of flashlights, all using XM-Ls (I read rumors of a PD32 using it).

Interesting idea, it would certainly be floody.

My LD20 (premium Q5) is still one of my most used lights although I wish it were neutral white.

Dsoto87 said:

Not everyone needs throw.

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Your quite right. I love my Zebralights which are flood lights. An LD20 with an XML would be WAY more floody than any Zebralight though. 300 lumens, all flood = not much light at any one point = not that useful (with the exception of extreme close up work - it would be great for that but the light is too long for that IMO). I like single AA lights for very close up work.

kramer5150 said:

Can Alkaline AAs keep up with this kind of current draw?

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Why should it have to? Turbo is not for use with alkalines anyway.

MichaelW said:

Why should it have to? Turbo is not for use with alkalines anyway.

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It certainly doesn't... I was just asking if its even possible for 2x Alkalines to produce ~330 OTF of an XML light.

Since when is it a crime on CPF to ask a question?

Certainly turbo of this hypothetical LD20 will work with alkalines. But drawing 3 watts from 2 cells means the regulation is going to be terrible. (diagonally downward sloping, instead of flat)
Fenix knows the performance limitations of alkalines, so high mode (if Fenix continues to only offer 4 output modes) would be the limit of nicely regulated output on alkalines. That would still result in a good 125+ OTF lumens (maybe more if they can source enough U2 bin xm-ls), and little perceptual difference between 330 lumens.

kramer5150 said:

It certainly doesn't... I was just asking if its even possible for 2x Alkalines to produce ~330 OTF of an XML light.

Since when is it a crime on CPF to ask a question?

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PCC has some drivers that will generate 1.5A at the LED via just 1V~3V input aka. 1 or 2 NiMH AA cell.

bigC