Buying lights from Lumicycle is like gathering all the best bits of Lego together to make the Deathstar instead of R2D2. Pick a battery, pick some lights, add a safety ring or two and you're good to go.
We picked the Pro battery, a 14.8-volt 4.4-amp/hour lithium-ion water bottle system with two cable outlets and hooked it up to a couple of Lumi's halogen units. We fitted one with a 20 watt mid-spread (17 degree) lamp and the other with a 5 watt spot lamp (7 degree) which we then fitted with a glow ring. So when riding in areas with street lighting we had a 5 watt spot with a nice visible glow ring, and when we hit the unlit roads we had a wide-spread, bright, 20 watt light.
It works a treat, offering excellent light spread and adaptability coupled with huge battery life and further system expansion capabilities (this battery will easily run a rear light and a front 10 watt Halide lamp for over four hours). If you're thinking of buying into a system you can add to at a later date, or change the lamp units in the housings with ease for either more light or longer run times, look no further than Lumicycle.