You don’t just need lumens you need very short lead time now if it’s for MM!
I believe you’re required to have a backup light with you out on track aren’t you?
In reality with it being as close as it is to the shortest night of the year (only about 6 hours darkness in total isn’t it?) I’d be surprised if you needed much burn time, plus you can always move lights from one bike to another so a couple of decent bar mounted lights and a couple of backup helmet mounted torches between the team should do the job I reckon…
Our team seems to be having a bit of an arms race, I’m using a magicshine and a couple of torches, theres a Nukeproof generator, a Maxx-D, a Joystick or 2, some ancient HIDs and some others, all of these will go in the “lighting” kitty at the start though and we’ll just see how we get on…
Are Tesco still doing their cheapy LED torches? Could be enough for a basic backup light or two…