*BLF LT1 Lantern Project) (updated Nov,17,2020)

Super late to the “group buy pre order” but I just ordered mine.

Vestureofblood has posted his review on his Youtube channel of the BLF LT1 Lantern! Here: >>

We have a problem.

I just received 5pcs LT1 and 4 & 5 pads are not connected. This is for the latest batch

I can solder the pads no problem but it may be for others

Send Sofirn a message and let them know ASAP.

Lexel told no need to solder.

Yeah, it’s what Sofirn just told me

Does this mean that 6 & 7 do not need to be bridged to give the increased output like in earlier releases ?

If those pads are not connected the lantern is only running on 3 AMCs

I had no contact with Sofirn for at least 2 months as the LT1 PM group is quite silent

What should I tell Sofirn as they mention you told them not to

I’m not bothered myself, I can add solder for the ones I sell but it means every review of lumen output is now wrong.

How many lumens approx is 3 AMC’s?

You really checked those pads with a DMM that they are not connected?

It seems that’s a new driver revision with 4 0 Ohm resistors on it if you look closer

Well, that answers that.

Thanks for the input Lexel.

For those who have the latest version: Is the USB-C charging working correct?

I see the resistors in that pic now, i was not aware that they added those.

at least there should be 0 Ohm, if they put 10Mohm there we got a problem

As Lexel says, the latest LT1 driver should have 0Ω resistors connecting AMCs 4 & 5 as standard. You can check that with a multimeter - you should see a short-circuit between the ‘4’ contacts, and another short-circuit between the ‘5’ contacts, even though they’re not soldered.

If any of you have a new-model LT1 and a multimeter, please try it and let us know for sure :slight_smile:

The 0Ω resistors make it easier for Sofirn to manufacture and do quality control, because they’re less prone to human error compared to manually soldering contacts with a soldering iron.

If you want more output from your LT1, you still need to solder the ‘6’ contacts together yourself. If you want still more output, you need to solder the ‘7’ contacts together as well.

If you want less output, you have to unsolder the 0Ω resistors next to the ‘5’ contacts. If you want still less output, you have to unsolder the 0Ω resistors next to the ‘4’ contacts as well.

If you change your mind afterwards, you can restore higher output by soldering the ‘4’ contacts together again, and then the ‘5’ contacts together again. You don’t have to worry about saving the 0Ω resistors, so it’s not a problem if you destroy them when you unsolder them.

The new driver also includes USB-C charging resistors to make it compatible with USB-C to USB-C charging.

If any of you get a new-model LT1 and have a USB-C to USB-C charging setup, please try it and let us know whether it works :slight_smile:

They could be 10k ohm resistors and probably work, but like Lexel said 10 Meg ohm would to be a problem.

If you don’t want to or are not able to solder across the pads, a #2 pencil lead across the gap between the pads and on the pads works well also. Easy to remove with an eraser too.

Revised driver

- Does not matter what combination of AMC pads 4, 5, 6 and 7 are closed.

- Added location for 0 ohm resistors so manual soldering of pads 4 and 5 is not needed.

- Added 2 resistors to allow a USB-C charger to work with the LT1.

  • This last piece should be tested before starting a full run.

I believe that what this means is that 4 & 5 and don’t need to be soldered as before and if you want less output then you can unsolder the resistors. You can close 6 and/or 7 (either with solder or pencil lead) to get more output but unlike prior driver versions it doesn’t matter if 7 is done but not 6. Before 6 had to be closed if you also wanted 7 closed.

Is there still a coupon for lt1?

I just watched Matts video and when I used his Canadian amazon link it gave me a discount right away. I tried the code but the code said it was invalid however I did get a 27.00 discount right away. I got the lantern + batteries. Matts video is linked on the first post