Complex sentence: They are run at slightly higher power levels than standard fluorescent lamps, but are made significantly thinner than standard fluorescent bulbs, which allows for more efficient reflector designs that get more light into the aquarium.
Split into simpler sentences: They are run at slightly higher power levels than standard fluorescent lamps, but are made significantly thinner than standard fluorescent bulbs. This allows for more efficient reflector designs that get more light into the aquarium.