Thanks. Pretty close to what I figured, but was hoping you found something eswitch and regulated. I was hoping to not use extra external resistance to keep the current low.
Ill try the first one in an l2 host with my inbound l4p driver and see what it does, maybe even measure with the l6 reflector loosely fitted.
Anyone have any good results with the (2mm2) Osram emmiters? Just recieved a couple but am unsure what I’m going to put them in.
Since they are rectangular instead of square, maybe a headlamp or bike lamp using a wide angle lens? The beam would then still be super tight in vertical orientation and super wide horizontal. :sunglasses:
They are not really very rectangular, it’s pretty close to square.
In a reflector it still makes a round spot, so have anything noticeably wider than taller you would need a lens, and even then it’s still pretty square.
Yes, but if you do use a wide angle lens meant for bike lights and such, and orient the slightly rectangular die in the same orientation, it should make an even more interesting beam shape than the lens would make with a truly square die. Add to that the fact of this particular die being such high intensity for throw, and you get something very special indeed! 
So is the XPL HI dead now?
For intensity yeah.
It does have higher efficiency and lower colour temperatures though for people that want that.
I changed the 2mm2 white flat (so not the throwier 1mm2 version that has a bit too low output I think for this light) in my mini-GT for a dedomed XP-G2 3D because of the much better tint, I do not like the very cool tint. It costed me just 15kcd.
The XP-L Hi comes in many tints but I was unfortunate to never have found a tint that was really great.
The GT mini has a FET 4.5A driver. Does this mean it’s direct drive or constant current? I want to use this led but don’t know if the stock driver will work.
Direct Drive. The XP-L HI it uses wont draw as much current as these two LEDs. You can use low drain batteries if you really want to do it
I don’t know where you read that the driver outputs “4.5A” but the whole point of a FET is that it will pull basically all the current the battery can provide (minus the resistance of the circuit in the host and driver).
I don’t think you’ll get 4.5 Amperes with a buck driver on an XP-L (HI).
Wow. That looks nice in the MF04S reflector!
With 2 18350 its possible to use my Buck driver regulated
unfortunately I only have a GT and a MF04S
I cannot kill one of them...
That’s a good video showing how bad that ledil lens is.
So much wasted and scattered light.
A single surface aspheric lens is the way to go.
Some ppl are saying you can DD this led (1mm) and some are saying you can’t. I’m really confused. If I use a keeppower protected 3500mah in a GT mini how much current will it draw?
for DD the current with full cell needs to be below 4.5A, so some older cells like NCR18650B with PCB may do only 4.5A when full
also you may try to solder simply a 1W 47mOhms resistor on each contact on the MCPCB to get the current limited
you need to check with a clamp meter