Essentially, a refugium is nothing more than a refuge from predation. Sessile inverts and other delicate species need a place to call their own and the advent of the refugium was just the ticket! Isolated, but connected to the main display tank the refugium allows for common water filtration while at the same time keeping more aggressive fish from impacting it.
I have seen a few ideas that allow light to be redirected over the refugiums but they were stop-gap measures. Better to have a proprietary lighting system designed strictly for the refugium. A 6500K and a mono-phosphor 7100K blue provide nice lighting for a tank this size. I recommend Energy Savers Unlimited (ESU) Coralife bulbs, or similar OSRAM lighting. These are ideal units that feature twin OSRAM fluorescent bulbs in a neat aluminum reflector. By shallowing the water column, via the sand bed, these OSRAMS will give the intensity needed for your refugium inhabitants. Being just 9 watts each, they radiate at a 75 watt, incandescent level! That's equal to 150 watts of incandescent light on a 10 gallon tank! Plenty of beneficial illumination. I used eggcrate cut to the inside dimensions of the tank frame and simply placed the reflector on this. Instant light hood! The reflector keeps stray light out of your eyes and keeps the rest of the room comfortable.
In conclusion, all we are striving for here is to provide a safe and quiet haven for our animals to flourish. I allowed caulerpas to grow, and even cultured some halimeda algaes as well!
I have seen a few ideas that allow light to be redirected over the refugiums but they were stop-gap measures. Better to have a proprietary lighting system designed strictly for the refugium. A 6500K and a mono-phosphor 7100K blue provide nice lighting for a tank this size. I recommend Energy Savers Unlimited (ESU) Coralife bulbs, or similar OSRAM lighting. These are ideal units that feature twin OSRAM fluorescent bulbs in a neat aluminum reflector. By shallowing the water column, via the sand bed, these OSRAMS will give the intensity needed for your refugium inhabitants. Being just 9 watts each, they radiate at a 75 watt, incandescent level! That's equal to 150 watts of incandescent light on a 10 gallon tank! Plenty of beneficial illumination. I used eggcrate cut to the inside dimensions of the tank frame and simply placed the reflector on this. Instant light hood! The reflector keeps stray light out of your eyes and keeps the rest of the room comfortable.
In conclusion, all we are striving for here is to provide a safe and quiet haven for our animals to flourish. I allowed caulerpas to grow, and even cultured some halimeda algaes as well!

