I have bought the 10k, 12K, and the twilight and atinic. I love icecap but I hate these bulbs. the 10 and 12K both look pink, which caused my tank to be way too pink. For what ever reason the atinic went very dim after a few wks, the twilight is ok but I want buy again. Luckily I had also purchased blue plus and aquablue special. I have 6 overdriven bulbs, so I replaced the two 10K with the blue special, I would have replaced the 12K but I didn't purchase enough bulbs. I replace the atinic with blue plus (I have 2 of these) but had to keep the twilight due to not having enough bulbs. The icecaps are now being kept for backup, just incase a bulb blows, znc I will need something to put in the fixture while I order new bulbs. Ice cap is a great company but I will never buy these bulbs again. I would love the thicker filiment, but I cannot stand the color, both 10 and 12K should not both be pink, they advertise one is white and one has more pink. I am telling you they both looked identical when lit up.
