Cree SC5 platform, XHP LED's

[easilyled]

Quad-dies in the past like the Seoul-P7 and Cree MC-E have presented a challenge in terms of throw due to a central donut in the beam which often needs to be smoothed by using a stippled reflector. If this is the case for this XHP, then it might not necessarily be a better choice for use in flashlights than the MT-G2 despite the die-area being smaller.

 

[RoGuE_StreaK]

Looks like they've essentially stippled the dome (if that's a real pic) in an effort to alleviate that side-effect?

 

[Mr. Tone]

I, too, wonder if that diffused looking dome will make a difference. The close up pics I have seen of the XP-L dome look similar to that.

 

[saabluster]

Looks like they've essentially stippled the dome (if that's a real pic) in an effort to alleviate that side-effect?

The texture on the dome is to help extract light. Acts as a sort of "AR coating" reducing the light's propensity to bounce back at the boundary layer.

 

[mds82]

I was able to meet with my rep today and he had a bit of a show and tell. This is a pic of the initial lineup of the XHP series. The XHP70 on the right contains the same die as the XL-P and is capabale of emitting over 4000 lumen which having a higher junction temperate rating of around 100C - 120C. Pretty cool..

 

[Mr. Tone]

^

I am guessing that the XHP70 is about the size of the MT-G2 based on that pic.

 

[mds82]

I believe it is a 7x7 footprint

 

[bigchelis]

I like the 6V inputs as of lately.

I bet that new emitter would do wonders direct driven off 2 IMR type cells.

bigC

 

[phantom23]

Eagletac is quick:

http://www.eagletac.com/html/mx25l3xhp50/features/index.html

XHP50 appears to be slightly throwier MT-G2.

 

[Hoop]

Call me a skeptic but I doubt that that 1m white wall shot of the Eagletac is... "accurate. "

 

[phantom23]

Who said it's accurate? Brightness and runtime are basically the same but has tighter(5.7° vs. 7.5°) and more intensive (61klux vs. 45klux) spot.

 

[easilyled]

Its worth trying out a light with one of these at some stage to compare it with my MT-G2 lights. I find it amusing that Eagtac claims that the XHP 50 version can produce a maximium 2800 lumens. It seems that they had to find that extra 50 lumens for the spec-sheet to justify its use over the MT-G2 which can "only" produce a maximum of 2750 lumens according to the specs!

Maybe the smaller die-size does enable the XHP-50 to throw further and if so, then that will be an advantage. Although if the reflector needs to be stochastic (ie orange-peeled) to tame the notorious quad-die donuts, then that may well nullify the advantage.

 

[phantom23]

I think HHP50 may work well with smooth reflector, it has 4 chips indeed but they're fairly close to each other and than covered with the frosted dome.

 

[easilyled]

I think HHP50 may work well with smooth reflector, it has 4 chips indeed but they're fairly close to each other and than covered with the frosted dome.

If you happen to come across this combination at some point, please let us know in this thread.

 

[degarb]

If my calculator is doing math correctly, 4357 candela 200 lumens for 20 hours. Seems impresive to me. Does eagletac have flat regulation?

 

[HumanLumen]

Datasheet now available!

 

[HumanLumen]

Datasheet now available!

....and, for the same min 70CRI bin 5000K and modified for 25 deg C, the J2 bin works out at aprox 931 compared to 920 for the MTG2 P0 bin, but with a slightly lower Vf for the XHP50

 

[HumanLumen]

Datasheet now available!

........but if you go up to 5700K at 70min CRI J4 BIN XHP50A-00-0000-0D0BJ40E2, YOU CAN GET 1002 lumen compared with 920 for the MTG2. Choices choices.

 

[clemence]

Had anyone here tried to use the XML base to solder XHP50? I see minor differences in the footprints

XHP50 bottom side dimension


XML bottom side dimension



This little XHP50 is an excellent candidate for those already using the XML2 Easy white (6V) as the 6V version of XML2 suffers from lower efficiency compared to the low voltage version. I plan to upgrade my motorcycle DRL lights using XHP50 soon!!

 

[RoGuE_StreaK]

Had anyone here tried to use the XML base to solder XHP50? I see minor differences in the footprints

I'm not seeing any differences except the separator dividing the two pads into four? So if running as 6V, to me it should work fine, as long as the soldermask and flux successfully keeps the solder to defined pads rather than bridging. Even then, not sure if a bridge from eg. anode to the thermal pad would be an issue, as theoretically the thermal pad is electrically isolated. Though of course if it's a direct path to the star (sinkpad etc) with good connection to the body then it may well provide a short path...:thinking:
So to be on the safe side, lay down four dedicated pad solder strips rather than two, or lay down two and get a toothpick and make a break in the middle. Maybe.