Q8 Dual footprint, quad LED copper DTP LEDboard interest List

[The_Miller]

Might I suggest a dual pad ledboard?
XHP70 won’t fit, but XML and Luxeon V will…

I will let Djozz do the talking

Lumileds Luxeon V, test of a 4000K 70CRI emitter

[image] It has been a long time since Lumileds released an emitter that was really appealing for flashlight use. In fact, ever since Cree smashed all prior existing performance with the introduction of the XR-E, the Luxeon leds never took the lead again. The tints (at same CRI) of the Luxeons were always good, and superior (IMO) to the Cree leds, but the performance lagged behind. So how about the new Luxeon V ? (confusingly there already used to exist a Luxeon V led in the old days, it is a bi…

The Luxeon V is a new high power single die white led from Lumileds that has a similar footprint shape as the Cree XP and XM leds but in size it is in between those. The specifications are quite remarkable (specs (link is external)), rated for almost 5A and 1700 lumen (which is similar to the Luminus SST-40) but with a thermal resistance of 0.8 degC/W, which is 3 times as low as any existing high power led. For the moment it only comes in 70 CRI (same story as the SST-40) and in 3000, 4000, 5000, 5700 and 6500K

Now that we know that the Luxeon V has very good performance but does not stand out way above its competitors (at least not when reflowed on a XP-board, on a dedicated board it may be different),

The beam is really good, quite a few new high output leds (Cree) have huge tint variation over the beam, while the luxeon V has a very pleasant beam with little tint variation, one of the best beams I have seen