Power Compact (PC) lighting, also known as Compact Fluorescent Lighting (CFL) is one of the most popular and widely accepted ways for lighting your aquarium. These powerful and energy-efficient lights are readily available and many consider these lighting systems the best overall "bang for your buck.” Distinct advantages include: a higher output than conventional fluorescent bulbs, smaller in size/length than conventional fluorescent bulbs and on average has a longer bulb life.