You can see the GT FC40 giving very natural colours, the XHP70.3 HI is quite yellow. I do prefer the beam profile of the M21G, I just wish Simon used the 90CRI version
Agreed, disappointing. Re. beam profile - that thin bright ring is another deal breaker about this light. Have you found out what exactly causes it? I don’t think it’s just the stainless steel bezel because I have Convoy lights with ss bezel that don’t have it.
If I remove the bezel it’s no longer there, so I feel like it’s the SS on this one or perhaps it hangs over the reflector edge a little.
I had a look at an S2+ with NM1 white and that has the ring exactly the same, just slightly less bright. It’s odd for sure
Similar ring around the outside with the 4X18A with SS, just not as bright as this M21 series
Coupons are not available at this time. I can give a gift instead of a discount.
it could be in two or three weeks.
It’s in production and XHP50.3 HI will be available soon
Hello Simon,
I am looking for a M2 compatible forward click switch do you have any?
Also I’d like a single mode (“tactical”) driver (not a 12 group that “may” change group by accident when switch quickly on/off/on/…) That could power 5A for a SST40, SFT40, or osram big flat white : it’s it possible?
Thank you
This sounds great, I’ll have to get some in my store
yeah, looking forward for those 17mm boost driver :)
Hey Simon will you start selling the 12amp driver used in the S21D individually?
I have some S21A i want to turn into quads.
I don’t think you should buy it separately, or at all. Really bad design, without any current regulation.
I also plan to replace it with an 8A, or install a 6A with a resistor modification.
Graph from the S21D topic ->
Looks like the FET driver has better thermal regulation though. Convoy’s other drivers aren’t programed to drop below 35%, this is fine on some lower amp models, but for some they get over 80°C
The 8A buck has no thermal regulation, only a timed stepdown over approx 9 min
Oh, I didn’t know that, thanks. Unfortunately, they all have something flaw.
Simon designs good hosts, but sadly the engineer who designs the electronics for him is not very good.
I would like to see a uncooled runtime graph.
In ZeroAir’s test, you don’t see this warming at all.
But it’s good to know that it was timed and not triggered by temperature.
Any chance of you using the SFP55 3 volt LED in one of your 3x21700 series lights? It does about 18,000 lumens at 150 watts.
Very interesting discussion. The yellow graph that I did below is S21D with 519a without any cooling. If you look at ZeroAir’s actively-cooled graph, the step-down is different from mine. ZeroAir’s Turbo runtime settles at 6 minutes at 1150lm/1750lm= 66% , whereas mine settles at *10 minutes* , at 37% .
Doesn’t this difference in both time and output imply that there is a temp sensor, and it triggers and affects step-down?
ZeroAir Graph (Active Cooling)
My Graph (No Cooling)
Maybe use a fan and you’ll get your answer 
Sorry, this is a different driver than what I was thinking. I thought it was the same as the 8A buck driver in the L21B and other 22mm models
No prob. You have great knowledge of Convoy lights. I actually thought it might be timed response too because my S21D always seemed to settle around 9-10 minutes.
But learned something interesting by looking at that ZeroAir’s active-cooling runtime that Tartarus referred too.
Just had a look at the driver and it looks exactly the same as what’s in the L21B. Maybe Simon changed the firmware for that model? If you look at the Convoy L21B SFT40 review on 1Lumen you can see it behaves differently.
Maybe I’ve been wrong this entire time and it has some kind of thermal regulation if kept below X temp. My 4X18A SBT90.2 drops to 35, but using a fan it then starts to increase in output. It’ll never drop below 35 though.
I’ll run a cooled test on an L21B later tonight
