BLF GT (preliminary) modding thread

Driving a XHP70 with just a 0.047 Ohm resistor will be disappointing at 6V
This would result in 5A
Also switching frequency would not be ideal, the diode would be quite close to its limit

I changed the Inductor, MOSFET, capacitors and diode with better parts for higher currents also the switching frequency will be set to a point where the drivers efficiency gets optimal
Also reducing the current sense resistor and lowering the current control voltage divider helps reducing heat

I should get next week the 20-40A synchronous Buck driver boards that I developed for CFT-90 and going to assemble and test the first prototype

Did someone find transparent 12/14mm switch covers?
I find only green and orange in the chineese flashlight shops

The only ones I know

13.6x6.3mm https://goo.gl/V3LJqr (it goes against my principles, but the link does not work without shortening it, sorry)
14x8mm http://kaidomain.com/p/S024710.Silicone-Tailcaps-14mm-x-8mm-Transparent
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Or buy the solarforce dummy batteries.

I got a higher reading at 15 meters when compared to a 10 meter throwing distance when I tested my GT.

Yes, most get higher readings are 15-20m.

If you do not then that is usually a sign that there is too much particulate in the air, be it humidity, dirt, dust, pollen ect.

I was thinking in driving the XHP-70.2 LED at 12v not 6v, but I have decided to wait until a better driver is available…

Speaking of said better driver. I have the parts incoming to test the prototype XHP70.2 TA driver for the GT next week if all goes well.

First in line when you start selling…

Also getting a prototype XHP70.2 mcpcb to test as well. :sunglasses:

Really pressing for them to make these for modders.

Thanks Ta , this is awesome !


Lux reading at 7 meter throwing distance for BLF GT.
1.163Mcd which give a throwing distance of 2157 meters.
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Measured at 20 meters. 1.153Mcd
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Thrunite TN42.
Measured at 10 meter 701Kcd

TN42 should be doing 750-800.
I would recommend investing in a real luxmeter.

NO 750Kcd to 800Kcd is much much too high for a non mod TN42.

Where did you get that from? Highest number I’ve seen is 728… The rest hover around 700.

You’re right, my bad, it’s 700-750.

Any suggestions?

I see 720Kcd from my TN42.

Read above, but the LX1330B is the best budget luxmeter.

OK,I’ve got it right now from Amazon.de.