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You want one of my Exposures?
I still have a Gomadic I've never used so I could do the AA thing but there's also the waste associated with all those batteries. Lithiums are expensive and NiMH often seem to lose voltage too quickly. I also dislike the Hope I have because there's no battery indicator - it just goes from on to off. Very stupid. But it is a convenient backup - if you lose the dyno being able to light the way with AA-power is useful.
I guess there's no right answer but I love having my dyno on the bike, fit and forget basically. I leave it on for daylight running mostly. Again I'll probably add rear blinky and a smaller helmet light/front light backup.
hippy
For the IPWR I'm using a Hope V1 as main light. I get two full nights off 4 AAs so it got me round PBP without needing spare batteries.
It's not as bright as a dynamo but I'm not going that fast and it's good enough as I'm not used to anything brighter. I have a higher power light for descending, bad visibility but it eats power so use sparingly.
You could use a dynamo, but you certainly don't need one.