Oooo
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I smell Cree rainbow (phosphor around LES)
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Given the hateful little G3s, I suspect the G4 is just bringing evil to a whole new level.
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Pessimists!
Yup, maybe next level Cree rainbow™
But due to domeless design I think it is somewhere in the range of XP-G3. Here is a beamshot with XP-G4 with dome:
Something like I expect for XP-G4 HI, maybe with some additional tintshift in corona around the spot…
Exactly, that’s why that guy who was asking about a mule, I tried pointing out that without deliberately mixing the colors (ie, industrial-strength diffusion film), he’s risking exactly that, but got waved off, so wtf, “you do you”…
I noticed that early on that with no optix at all it had horrible horrible angular tint-shift. Just holding it near a wall would have piss-yellow in the middle and ice-blue around the periphery.
Just what the intended market for G3s and now G4s might be, I have no idea, but any lighting that uses them must be pretty shiitey.
Was about to say this could be ok like the XML3, but then saw the XPG4 beamshot with the brown hole…this tint shift is in the opposite direction as normal emitters. Usually they emit blue to the front and yellow to the periphery, but this seems the exact opposite.
I imagine that shot was with a reflector, no? In which case it’s legit, yellow periphery hits the reflector and makes a piss-yellow hotspot, blue spill that misses the reflector gets send forward.
You gotta hold the nekkid chip pretty close to the wall to see the “reverse” (yellow periphery and blue center). For me, it was just inches away from the wall. Beyond that, its muleishness would render its brightness so dim as to be useless to see/compare.
Actually, I got it wrong in that post above. I was used to the “reflector way” vs holding it close to the wall. So reverse what I said above: it’s blue center and yellow periphery with no optix.
Ohhhh okay that is more in line with the behavior of most LEDs. I used to have an LED maglite that can open up to show the bare emitter, which exhibited very obvious blue to yellow tint shift going from center to side.
Something strange is up with the XPG4 though. With most LEDs the tint shift goes neutral hotspot (a mix of sideways and frontal emission), yellow corona (yellow sideways emission only), and blue spill (frontal emission only). Here we see a yellow hotspot and then the amount of blue monotonically increases with angle away from center.
This beam is also present in several meters away. It’s not faked or somethin. The shot was taken around 1.5 m away from the wall (around 59 inches, slightly more than ‘just inches’)
The LES of the XP-G4 with dome is more yellow in the middle. The blueish tint is more on the edges of the LES.
Have you tried putting it in a reflector? Would that invert the behavior (blue spot, yellow spill)?
It was in an ordinary reflector of a Convoy C8 (SMO), along with a standard 3535 center ring.
I will release a test of the XP-G4 soon, which should clarify some things here.
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Looking forward to it, thanks!
Test of XP-G4 with dome is out
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An array behind TIR lens(s) would be okay, surely?
I assume intended application is fixed lighting, streetlights, etc, where you use a bunch together and mix the beams.
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Yeah that’s probably it. Big arrays of TIR lensed LEDs, run at low/med currents for the really sweet efficiency. You get tons of pretty neutral, slightly positive, high CRI light that way.