Hi guys, The bulbs in my main tank are coming up for replacement soon and I was looking on the Aqua Essentials site and saw these T6 lights, http://www.aquaessentials.co.uk/index.p ... cts_id=200 Has anyone used them? Are they really that much brighter? I ask because I have the 70cm Jewel double unit that has two 18W, 24" bulbs in (currently Interpet Daylight Plus). The T6 option seems to be only 2W per bulbs higher wattage. How can they be so much brighter? Any opinions/experiences will be most gratefully recieved!!!