BLF GT (preliminary) modding thread

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.

I would get the “real” LX1330B (Dr. Meter brand) , but shipping + import fees is 29$ extra !

Why do you say the others aren’t real.
Do you have a reason to believe they are different?

Dr. Meter released the LX1330B , and later the other no-name LX1330B appeared . I don’t know if the internal components and it’s calibration are the same or not .

The one that TLF tested and found good was actually no-name:

The first test of the XHP70.2 driver for the GT went well tonight. We just need to figure out how to bypass the carrier button top springs.

Some tweaking is needed but at least it works. More will come as I have time.

Maybe awg 22-24 outside the spring will fit under the brass button , haven’t tried it .

For a DIY setup there are a few possible options but they are not simple. I am trying to find a more consistent option that is simpler.

Worst case this is what we might have to do.

I have the worst case situation setup in the GT right now with the ultra low Vf 80cri 4000k emitter. I am going to do some testing and see what the limits of the system are. I am worried that it could overdrive the emitter as it maxes out lower then P2 bin emitters.

Are you testing a buck driver for xhp70.2 ?

How many amps can provide max ?

I am testing a Texas Avenger driver for the xhp70.2. Since the GT is so large it was pointed out that we might as well give it all the power.

The stock buck driver is good for around 6A, which is good enough but also leaves a few thousand lumens on the table with a P2 bin emitter that maxes out around 10-12A (at 12V).

I plan to order a P2 emitter for testing this weekend or next week.

In the early test I am guessing it was around ~7A but I was only using laptop cells since I did not want to melt the springs. With high drain cells it would be a lot more power.

Properly setup I am guessing it will be around ~10A+ with high drain cells and bypassed springs on a P2 emitter. That should be good for over 9k lumens (possibly peaking over 10k lumens for the first few seconds).

Oh my God…
And what about the throwing,700K,more,less?

Nice , keep us updated TA .

A quick measurement on the prototype showed a slight improvement corresponding to the slight increase in output with the dome on (just under 1400m vs ~1350m at 6A on the old driver and this is with laptop cells).

So I assume with the shaved dome and a P2 emitter that the prior numbers would only be improved upon but won’t know for sure until I try it.

Either way, why hold the LED back if the light can take the heat is my thinking. The regulated runtime would be short anyways with the xhp70.2.

I like your thinking :+1:

Push it to the limit! Keep us posted, I know I need one :smiley:

Ok, finally got caught up on the MT09R mods for the day and had some time to mess with some other things. I think I figured out a way to make lumen spheres to sell much easier and better. I already made one today that is within 1% of my sphere. I am thinking about selling them if there is interest.

The real fun though are the GT’s. I have now modded both of my XHP70.2 GT’s with the new TA drivers, installed the M4 80cri 4000k XHP70.2’s in both of them, 1 with dome on and the other with dome off.

I also got some readings. Keep in mind that I just sent my good meter to another member on here last week as part of a trade and I am needing to order a replacement. So I am just using my cheapo HS1010A that I know reads lower then my Dr lumens meter the old readings were from.

So these readings are with the lower reading meter, only taking readings at 7m, and the 4mm tall centering ring (higher numbers can be had with the shorter ones but you get a dark spot in the beam as you go shorter) I am now getting:

Dome on XHP70.2 M4 80cri 4000k - 520kcd for a whopping 1450m of throw!

Sliced dome XHP70.2 M4 80cri 4000k - 725Kcd for an even more impressive 1700m of throw!

Edit: For comparison I took a measurement with the stock GT to see what it would do on this meter. I know with the Dr meter this GT got over 1mcd on a low humidity day.

Stock XHP35 HI 4000k GT on this cheap meter - ~850Kcd - ~1850m of throw

So this means that the XHP70.2 with dedome is somehow reaching ~80-85% of the xhp35 hi throw levels!

I am pretty sure the dr lumen meter was reading about 10-20% higher then this one but did not compare them before sending it off.

I also held a small reflector over the LED to get some lumen readings in my sphere and it read well over 9k lumens! It was so powerful it started to melt my diffusing layer, which is why I set about making a replacement sphere to have on hand in case this one ever was damaged enough to change the readings.

Now far as the beam goes, the dome on version has a very nice beam, very close to the stock tint with a tad more yellow that is inherent with the xhp70.2.

The dedomed XHP70.2 does tint shift quite a bit warmer, between 3500-4000k if I had to guess. It is not bad but not for everyone.

I also stress tested the driver and light setup by cooking it with thermal control turned off and 8 30q cells until the LVP kicked in. It got up over 190f degrees but everything is still working great and these numbers are after that abuse. So I think I can say that the driver is stable at this point!

I am busy with the MT09R modding right now but if there is enough interest to sell ~20-25 drivers I can order the components and build a batch.