The nail polish coating isn’t perfect and there might be some low-key shorting which prevents the driver from pushing 1.5A, or prevents the driver from entering the turbo mode. Which I will figure out the way to measure the tail-cap current draw.
I might have overloaded the luxmeter and it stops scaling properly past 100k lux (which is it’s stated maximum range, although it continues to register the brightness over 100k lux anyway). I might try to test again from further distance and see what happens.
75 cm is likely still too close. The main reason is that the beam is not fully collimated at short distances. I’m not sure what is the minimum good distance for C8 but if you can measure at 5m I think that should be enough.
Also, what you measure is not output but intensity. I’m nearly sure that at the same intensity XHP70.2 has much higher output.
Correct Agro, a minimum 5M throw distance should be observed for Standards.
On lights I’ve built with a mile or more throw capability I use 50M for testing. If you have the light focused for optimum distance, the V shape of the beam profile hasn’t come together at closer distances and the meter isn’t getting the concentrated light to show the true throw reading. After getting lights that throw a mile or more, I can’t think of a couple of hundred meters as being throw, gonna take 3/4 of a mile or more to consider it “throwy”.
I received the two samples yesterday, but need a few days for the test because life is quite in the way this week, no spare evenings in my cave behind the cupboard at least until the weekend.
@rngwn, could we have a picture of the GT-FC40’s footprint, please, to know if it is the same as the XHP70’s footprint (in order to swap emitter of a 12V XHP70 flashlight with larger MCPCB) ?
Any updates on the GT-FC40? Acebeam is planning to use the A4 bin in 4500k in their E70 and if the tint is similar to your images will hopefully be just as beautiful.
Thanks, for the heads up. I like this post the best and it seemed like you guys knew what you guys were talking about. I will search the forum. Toodaloo. :face_with_monocle:
Well, someone else woke this thread up… so I am going to comment on it as well.
I now have 2 lights with the 4500k version of this led. The tint and CRI just blow me away! I will be converting several XHP70 lights to use this LED over time. Right now all I have are a stock S11 and M21b, both have become favorites for night walking lights with the small reflectors they just light up everything in front of you with a wonderful rosy light.