Cree MPL 1500 lumens @ 250ma

[Lumencraft (Matt)]

Hi all,

I am sure by now a few of you have noticed this on the market. I didn't think much of it till I saw it for sale at cutter. If I read the specs correctly on this 25-27 is the voltage on this, which at 250ma is not a big deal, a good stack of 7x14500s could get us there.

What I am wandering is if anyone has ordered one of these yet?

Does anyone have driver ideas?

How far is this LED able to be pushed? 300ma 400ma more?

 

[spencer]

25V at .25A is 6.25 watts. 1500lm at 6.25 watts is 240 lumen per watt. Something is not right there.

 

[italianboy]

Here you can find the datasheet: http://www.cree.com/products/pdf/XLampMPL-EZW.pdf
It seems like the package consists of three individually addressable series of LEDs, which can be driven up to 250mA per string.
I think you can choose to wire them in parallel (25-27V @750mA) or in series (75-81V @250mA); however this LED does not seem very suitable for flashlight use. Also, it's gonna be very floody.

 

[spencer]

So 25V at .75A is 18.75 watts and 1500 lumen at 18.75 watts is 80 lumen per watt. That is better. Doesn't touch an XP-G though.

 

[Hack On Wheels]

25V at 0.15A is 3.75 Watts. Using the middle flux bin in the list shows 900 lumens at 0.15A. That gives 240 lumens/watt. I must be missing something... back to the data sheet to check the number of dies. Assuming the 25V is just for one of the 3 strings then the lumens/watt scales down to a fairly disappointing 80 lumens/watt. I would have thought that a number of dies being run at a lower current would really increase the efficiency?

A mule style setup or a heavy stipple reflector would make this into a pretty solid area lighting tool. 25V is still fairly high, so you would probably want at least 4 RCR123s with a good quality boost converter. It'll be interesting to see what applications these get used in.

My initial reaction was that the beam would be a total mess, but I'd be very interested to see beamshots with different reflectors. Depending on the packaging and the die sizes, perhaps it might end up being not so bad after all. I'm having a hard time predicting that...

 

[Hack On Wheels]

Yeah, looks like only 80 L/W at 0.15A... too bad.

The electrically neutral thermal path is nice, imo. The efficiency is a shame, but depending on pricing I could see using one of these for a floody bike light or a stationary worklight. If the pricing isn't competitive enough, then an array of XP-Gs makes more sense for that level of output (or an SSR/SST-90 of course).

 

[Lumencraft (Matt)]

Yeah, looks like only 80 L/W at 0.15A... too bad.

The electrically neutral thermal path is nice, imo. The efficiency is a shame, but depending on pricing I could see using one of these for a floody bike light or a stationary worklight. If the pricing isn't competitive enough, then an array of XP-Gs makes more sense for that level of output (or an SSR/SST-90 of course).

The neutral thermal path was one of the things that excited me the most as well.

The price at cutter right now is only about 25$. I was considering it since I had already planned to order a batch of some other leds from there, that way the additional shipping cost from AU is not a prob.