I ordered one of the S2+ w/SST40 on @ $13.95 2 weeks ago.The day after ordering it said shipped but it's still sitting in China.I also ordered a standard black S2+ w/XML2 @ $9.95 to use as a host for a triple LH351D build.
The 7135*8 Driver L2 in cyan,purple and orange S2+ are in the FINBG2020 30% off deal.That's 30% off $16.99 or $17.99 depending on the emitter
Yes, IMHO working well. Can’t say anything about efficiency, but temperature protection works well, keeps the S2+ touchable for 2sec when heated up. Judging around 50C,which for aluminum feels quite hot.
The S2+ w/SST40 1800LM arrived today,16 days after ordering from Banggood
The plain white cardboard boxes were thoroughly crushed in the shipping plastic bag but the lights were not damaged.The lights were in bubble wrap sleeves.
The gray color looks more like a blue to my old eyes.Both the driver and tail cap springs are bypassed and there's a brass ring securing the driver in the brass pill.No solder on the ring or pill.
The reflector is smooth and the MCPCB is copper core.There's a butterfly style plastic reflector spacer.
The tail cap switch is a non illuminated black rubber button.
'll probably move all the parts to a green host I have unused.Not fond of the gray/blue.
A closer examination of the S2+ with SST40 I received I found that the bypass wire on the driver spring was too short and not soldered onto the driver at the base of the spring.I've since replaced the factory bypass wires with .075" copper wick.
The light seems to benefit from higher amp cells like the Samsung 30Q and Sony VTC5D that's not to say a 10A Sanyo 18650GA is bad but the higher amps delivers higher brightness at 100%.
The 30Q is very cheap at Liion Wholesale but shipping is high
The whole light gets very very warm and impossible for me to hold in my hand after several minutes on 100%
I'm a novice so judge what I've said in that context.