Not sure what Simon uses, but I like 63/37 leaded solder. It has a lower melting point and it’s easier to work with.
Tin wire brand “MECHANIC”
The key is the soldering iron,
T2 solder iron , The temperature can reach 400 degrees Celsius, and use use D24 soldering iron tip
It’s much easier if you preheat your host. A little while in the toaster oven to get it near 100c makes it much easier on your soldering iron.
How are the LH351D bins from Simon?
I’m looking at getting a couple T2’s maybe in 4000K, or 3500/2700K
I’ve have some S2+ with 2700k and 5700k and the tints are fantastic. The 5700k has a very slight green tint but hasn’t caused any issues with photography. If you follow the Instagram link in my signature you can see some photos taken using these lights.
Awesome!
Does S21A and S21B have the same size reflectors?
I need replacement for S21B, however in the store is only for S21A
Oh no, I whished for 0.1%mode on T2 but also 0.2~0.5% should be fine
Simon for your others FW Drivers can you consider to put 3 more groups?
0.1% 1% 10% 45% 100%.
0.1% 1% 10% 35% 70%
1% 5% 20% 50% 100%.
It will give more flexibility based on the type of driver used and limit the maximum power for extend runtime.
Can confirm that it fits.
Thanks 
You could just replace the driver with another 17mm driver that has whatever modes you prefer.
Thanks. Do you use leaded or lead free?
Hello Simon,
Can I ask for an option for ordering Convoy L21A with the B4-40E tint choice of XHP35 HI on the product page? (B4-40E is currently available as a separately purchased LED, but I would like to purchase L21A already assembled with B4-40E)
Also, I would like to ask that choice for the other two flashlights (M21C, M21B).
Hello Simon,
You had 18650 and 21700 battery from Samsung, Sony… in your store. Now you have liitokala batteries. Would you offer them again? Should I wait? What happened, when you do not offer them no more? Thank you very much.
Yes, they are the same.
Switching from 50% brightness mode to 100% brightness mode, the naked eye cannot perceive this brightness change.
So I don’t think this ratio is reasonable.
My suggestion is that the ratio of the previous mode of 100% mode should not exceed 40% at most.
i use leaded.
I once asked workers to try lead-free tin wire,
Work efficiency became very low, so I gave up,
CRI90 B4-40E?
I’m not sure if it can be ordered,
The current prices of these batteries are ridiculously high,
If prices return to normal in the second half of the year, I will resell them,
Aren’t those XHP35 you have in store 90CRI?