For reef aquariums, you may use acitinic lights. These are kinds of lights that have UV wavelengths. These UV lights penetrate the water and this makes it easy for corals and other invertebrates to absorb light.
Perrys Aquatic Centre
The Bungalow 6 Market Rasen Rd. Dunholme, Lincolnshire LN2 3QRPhone: 01673860727