I've used a few different types.

Halfords Ring Ice : These were the cheapest and best solution I found. More light on the road than LED's but they use more power. I sold them when I got the VisionX

VisionX Solstice : Expensive, and I'm glad I bough them second hand, because they are abysmal at getting the light on to the road and I would have cried if I'd paid full price for them. Yes they are very bright when you look at them. The upside is they run on next to nothing and make great Daytime Running Lights.

Halfords super cheap (�15 if I remember) : These were great at getting light down, again they use much more power than LED's and the quality wasn't great. The reason I don't have them now is because the lights fell apart....

Today I have nightbreaker bulbs fitted to the headlights. These are perfectly adequate for my riding style (I'm not concerned with what is in the dark patch in front of the bike as long as I have some middle distance light). I have the VisionX LEDs as DRL's They help to fill in the gap left when main beam comes on.

[Visionx might actually be Xvision - I can never remember!]

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Never underestimate the power of stupid people in large groups.