Linger
Flashlight Enthusiast
You've seen the xpg mods and the multi-emitters. Nailbender and I took it one further and used an xp-g engine to dual-mount two emitters: the most efficient format for your upgrades, mods, or custom builds.
(Integrated sphere tested: 2xR4's with 515 lumens out the front @ 2.5 amps)
A CPF creative collaboration with Nailbender and Linger. Two xp-g R4's, reflow soldered on a single board. These emitters are in parrallel, dividing the current between them and each facing the full voltage.
Background
Never a person prone to exaggeration, David Chow wrote that our jaws would drop when the specs for the new xpg were released. Since the introduction of the xpg a number of new applications have been tried. The rush of announcements in the homemade / modified section reveals widespread acceptance of the xpg and an embrace of the remarkably high efficiency this emitter provides. One of the common themes among these mods is the floody, unfocused image that result from the xpg's larger emissive area, and the use of reflectors and optics designed for the xre / xpe.
Comparison
Here is a head to head comparision of the xpg vs. xre. I control for all other variables with application of standardized components. Both lights use AW 18650, are built on identical DIY copper pill + OP reflector, two 3.0v-8.4v 5mode circuit (the Solarforce circuit). Lights are set on diningroom table ~3ft from beige wall. Hosts SF C2 and Solarforce L2
Low - xpg on Left. Hotspot is much larger and less defined then xre, blends very well towards sides.
High (switched hosts) The xpg almost appears as if it were two xre emitters, one with a spot and dim corona just like xre beside it + and additional xre with a boom-m or rippled optic creating that nice bright distribution away from the center. Even in comparisons of the beam edge, the xpg is significantly brighter.
Outside the effect is pronounced. The xpg (with xre / xpg reflector) really lights up an area.
Possibility
Here is xpg over-driven to 2.5a, head to head with an mc-e. Both lights use identical drivers for this shoot, though reflectors were much different (xpg smo d26 drop-in, mc-e MG PLI)
Thinking about how best to use this little emitter, I was stuck on something I'd never heard my partner say before, her words when she first saw the xp-g package: "wow, that's tiny.":shakehead The little xpg is small, Cutter compares its demensions to the Rebel.
Implementation
A few weeks ago I put an xpeQ35A, who's small footprint the xpg shares, and placed it on the contact pads beside a Seoul P4.
This was one of the 'high cri' binned P4's and while the added depth the higher CRI provided was great I found them a bit cool for wildreness work and decided to add the warm binned Cree. I put in on there with the intention of taking it off. It was a proof, a demo if I could 'reflow' solder w/o paste, to test mixing and blending options between two emitters. (highly successful experiments)
Linger's Line
And this leads to the double, a line of xpg's together on a single pad, sharing the contact points.
Two xpg's on a 10mm board, the most efficient LED's at the lower end of the power scale, used together to increase output. This configuration take advantage of all of the xp-g's leading attributes. Small package size for tightly grouped emitters. Large emissive surface and floody beam optimal for grouping multiple emitters together. High efficiency and low vf are ideal for single cell applications, of course multi-cell configurations work well with high-efficient emitters as well. Two xp-g's reflowed in a line on a single engine puts out a brilliant floody beam, slight donut that is not visible outdoors. With ~3.5vf, it is perfect for single cell applications. A higher current driver is indicated as the emitters, in parrallel, can take 2000ma (1000ma each) @ spec. Jtr's White Led testing seems to indicate the 'sweet spot' for the xp-g is at 1400ma. If you used this line configuration, an 8x7135 driver providing roughly 2800ma may be an optimal set-up. Beam quality varies considerably with reflector. Ledil Boom's are fantastic at covering up the entire crispy creme donut chain and if you put one on the xpg line you'll have a perfectly smooth beam. The Fraen may be another excellent option, kicking the range up and providing a defined hot-spot , but this needs additional verification (sun's come up here).:thumbsup:
Nailbender will be offering these, available along with his wide range of d26 drop-ins.
http://www.candlepowerforums.com/vb/showthread.php?t=248771
Best,
Linger
Never a person prone to exaggeration, David Chow wrote that our jaws would drop when the specs for the new xpg were released. Since the introduction of the xpg a number of new applications have been tried. The rush of announcements in the homemade / modified section reveals widespread acceptance of the xpg and an embrace of the remarkably high efficiency this emitter provides. One of the common themes among these mods is the floody, unfocused image that result from the xpg's larger emissive area, and the use of reflectors and optics designed for the xre / xpe.
Comparison
Here is a head to head comparision of the xpg vs. xre. I control for all other variables with application of standardized components. Both lights use AW 18650, are built on identical DIY copper pill + OP reflector, two 3.0v-8.4v 5mode circuit (the Solarforce circuit). Lights are set on diningroom table ~3ft from beige wall. Hosts SF C2 and Solarforce L2
Low - xpg on Left. Hotspot is much larger and less defined then xre, blends very well towards sides.
High (switched hosts) The xpg almost appears as if it were two xre emitters, one with a spot and dim corona just like xre beside it + and additional xre with a boom-m or rippled optic creating that nice bright distribution away from the center. Even in comparisons of the beam edge, the xpg is significantly brighter.
Outside the effect is pronounced. The xpg (with xre / xpg reflector) really lights up an area.
Possibility
Here is xpg over-driven to 2.5a, head to head with an mc-e. Both lights use identical drivers for this shoot, though reflectors were much different (xpg smo d26 drop-in, mc-e MG PLI)
Thinking about how best to use this little emitter, I was stuck on something I'd never heard my partner say before, her words when she first saw the xp-g package: "wow, that's tiny.":shakehead The little xpg is small, Cutter compares its demensions to the Rebel.
Implementation
A few weeks ago I put an xpeQ35A, who's small footprint the xpg shares, and placed it on the contact pads beside a Seoul P4.
This was one of the 'high cri' binned P4's and while the added depth the higher CRI provided was great I found them a bit cool for wildreness work and decided to add the warm binned Cree. I put in on there with the intention of taking it off. It was a proof, a demo if I could 'reflow' solder w/o paste, to test mixing and blending options between two emitters. (highly successful experiments)
Linger's Line
And this leads to the double, a line of xpg's together on a single pad, sharing the contact points.
Two xpg's on a 10mm board, the most efficient LED's at the lower end of the power scale, used together to increase output. This configuration take advantage of all of the xp-g's leading attributes. Small package size for tightly grouped emitters. Large emissive surface and floody beam optimal for grouping multiple emitters together. High efficiency and low vf are ideal for single cell applications, of course multi-cell configurations work well with high-efficient emitters as well. Two xp-g's reflowed in a line on a single engine puts out a brilliant floody beam, slight donut that is not visible outdoors. With ~3.5vf, it is perfect for single cell applications. A higher current driver is indicated as the emitters, in parrallel, can take 2000ma (1000ma each) @ spec. Jtr's White Led testing seems to indicate the 'sweet spot' for the xp-g is at 1400ma. If you used this line configuration, an 8x7135 driver providing roughly 2800ma may be an optimal set-up. Beam quality varies considerably with reflector. Ledil Boom's are fantastic at covering up the entire crispy creme donut chain and if you put one on the xpg line you'll have a perfectly smooth beam. The Fraen may be another excellent option, kicking the range up and providing a defined hot-spot , but this needs additional verification (sun's come up here).:thumbsup:
Nailbender will be offering these, available along with his wide range of d26 drop-ins.
http://www.candlepowerforums.com/vb/showthread.php?t=248771
Best,
Linger
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