Match's Contest: Guess the Lumens and win a prize!

[Match]

Folks,

I'm noticing some possible confusion here. What I've done was test a bare cree xm-l directly bonded to a big chunk of copper, which was attached to my 25lb aluminum test block. This test was exactly like all the other emitter tests I've performed, except I've eliminated the pcb (star). Just the emitter...no optics, no collector, no worries

Hope that helps.

[fishinfool]

@Davx

Really difficult.. the test say 996,8 but in a flashlight are 1145 otf... Let's say 1001!

Thanks for this "game"!

Sorry Davx but I picked that # in post 59.

[sixty545]

[Edited] Is it a T6 or a U2 or....

My spreadsheet says that your old setup had a thermal resistance of 5.7

The new setup Has a more direct connection to the die so I would guess a Resistance of 5.5 . A T6 should give....... 1000.7 lumens

[JamesB]

1364

[eg1977]

$1 Bob

[T.H.Cone]

@eg1977

$1 Bob

My bride is a big fan of that show, so I got a pretty good laugh from that. Thanks.

[viktori]

1013 is my guess.

[old4570]

NO BASE/STAR !

1400

[okyeung]

1338, all-in!

[bibihang]

This post is like a random number generator lol :D

Ok, so here is the number, 1010 generated by me.

Thanks Match anyway!

[cabfrank]

1109

[mrradlos]

@sixty545

Is it a T6 or a U2 or....

My spreadsheet says that your old setup had a thermal resistance of 5.7

The new setup is shorter but has a more direct connection to the die so I would guess the same number. If it is a T6 let's say it is 996 lumens.

That's easy: Take in account the old resistance of 5.7 ... uncertainty of LED (T6 + U2) / 2 ... 6'416mA at max Flux ... old star vloume Pi*(0.02m)^2*0.03m ...

=1'268 lumens - no need to gess (and 100 lumens mote than the SST 50 on star)

[apt323]

Edit - 1023 woot

[Davx]

@fishinfool

@Davx

Really difficult.. the test say 996,8 but in a flashlight are 1145 otf... Let's say 1001!

Thanks for this "game"!

Sorry Davx but I picked that # in post 59.

My bad! I've already mod it! Sorry

[cheaplite]

@Match

I’m curious, how do u get power to and from the led ?

Gentlemen,

After a very frustrating few hours, I have just finished testing the output of everyones favorite Cree XM-L while directly mounted to copper, similar to this. In celebration of this (whoo-hoo!), I've decided to do a giveaway of sorts.

Here's the deal!

- Post below your best guess as to the max lumen output achieved during the test. For reference, the testing was conducted exactly as my other emitter tests as found here. (big block -o- copper/alum, regulated power supply, Fluke RTD temp and amp monitoring, 30sec stable, yadda yadda yadda....)

- No, you do not get to know what current level the testing stopped at. But, looking at the data from the previous xml, mc-e, and sst-50 tests may give you an idea.

-Post as often as you like, but one guess only. If you change your mind before the contest is over, please re-edit your first "guess" post.

- Contest to end next Sunday night (5/20) when I finally make a new post of the xm-l testing results. Then everyone gets to see who was closest. Yes, this means I get to sit on this delicious data for a whole week! muhahahaha....

Here's the Prize!

A long time ago I was sent a light by one heck of a great member here. I don't want to name any names, but it rhymes with "MacktheStripper" . The intent was for me to mod it, then use it in a givaway of some sorts similar in concept to this one. This drawing here is my attempt to make good on this deal.

The bugger of it is, that little 3xAAA incan light has been an albatross around my neck...for I have a hard time seeing any potential with it (too short for 18650, to fat for a single eneloop, and the host material has more in common with Playdough than any actual known metal). So, while the rest of you are feverishly speculating lumens, I'm going to try my damnedest to make that little light special for the prize.

Since I never roll without a back-up plan I cowardly reserve the right to offer up another of my mods in place of the afformentioned light . Depending on how frustrated this comming week is and the nearest proximity of a ball-peen hammer, this may end up happening. Regardless, I'll post a shot or two of the light and any progress (or lack thereof) made.

Time to put on your Thinking Caps and start guessing!

Best of luck,

-Match

[fccwpe64]

hmmm..... 1220. My guess...

[teachtom]

My guess would be --- 1207

[NightCrawl]

@cheaplite: He soldered to the tiny silver squares you can see.

[Rusty_Joe]

When will we find out?

[DrJones]

1414.

I'm Curious about the result :)