1. C8 and C8+ refer to the body, it’s the driver, LED and anodisation colour that changes to give all the variants.
So all Convoy C8s use the C8 body and all Convoy C8+s use the C8+ body. There are slight differences between the plus and non-plus versions but i don’t think they affect waterproofness which should be on par with the S2 for both models.
2. The drivers i know have temperature regulation, i don’t know if any don’t. The driver will be selected to match the LED, mainly for power reasons rather than functionality, so unless you’re going significantly away from standard offerings (and i don’t see anything that says you are) there should be temp regulation.
3. Good throw means different things to different people, i have no idea what it means to you. The CSLNM1 will have the most throw but also the narrowest hotspot and least spill. The CULPM1 and SFT40 will have slightly less throw but a bigger hotspot, but will use a bit more power to get there.
These will be narrow spotlights with little spill though, if you want to light up a field you would need something with more spill.
If you have an idea of how far you need to see, whether you need to spot a target or search for a target, and how long you need to go between charges we could help narrow down the options for you.
Also, do you want white light or coloured light? The CSLNM1 comes in red, blue, and green, as well as white.
4. I think the C8 and C8+ meet this need, and the standard drivers can be set to single mode only, at 100% power.
5. Convoy state: Battery: “C8 runs on 1pcs 18650 lithium battery (protected or unprotected)” and i’ve not seen any mention of batteries not fitting. Protected batteries fit in my C8s, i don’t have any + versions but can’t see there being any difference.
You need to make sure that the protected battery you use can supply the current required without tripping it’s protection circuitry. Shouldn’t be too hard to sort out though, will depend what LED you choose.
6. The only remote switch i know of is the one Convoy offers: https://www.aliexpress.com/item/32801326773.html
I don’t know if it will be suitable for you, and there may be others out there.
7. No idea, sorry.
Not sure what your extra question means tbh, sounds like you want to buy 2 C8s, one with good throw and one with better throw which i don’t understand.
Hope that gets you started 