I tell ya. I have used a lot of different lights.

All in all, I still really like my front fork mounted generator light. It is the traditional 6V tire friction bottle generator, but it really does work well.

I use generator lights I bought in Japan. These are not the cheap-O made in China toys that you get at the department stores in the USA. These are solid and reliable. Thnk about it. 6V is more than four C cell batteries. You can even use halogen bulbs. If you used some high powered LED with a 6 V generator, you could light up the whole city. Drivers would be flashing their high beams at you to remind you to go to low beam

I dream to one day have a hub mounted generator, but they are still more costly than I want to pay.

If you ever have a friend going to Africa, see if they can buy you one of the 12V generator lights sold there. Those are tire friction bottle generators too, but they are 12V and throw out a beam like a motorcycle. I guess in Africa they don't have street lights and being able to see what is in front of you in Africa can be a life or death thing, so they have honkin' generator lights.

Obviously, a 12V generator is going to put a lot more load on the tire and the rider than a 6V and you need to consider that. First of all, they aren't appropriate for thin-walled skinny tires. You have to make sure that the bottle generator rides on a thick piece of tire rubber - like the sidewall of a fat-tire or maybe the top skin of a cross or road bike.