I think Bang Guy might have a point, but it's not really critical in my opinion. I would buy them all at once online to conserve shipping costs, and if you do want to adjust the lights gradually you can either put them all in and run the lights fewer hours at first or replace a bulb every few days or so.
As far as online sources go, I look at both captivereefs.com
, which is one of our sponsers, and hellolights.com
. Both are good sources. The gentleman at captivereefs.com was very nice and had great communication.
92-gallon corner tank, 100lbs of LR
, 140lbs of sand, 250watt 10,000K MH
, 110watts of actinic PCs, Mag 7 return, custom refugium, AquaC EV180 w/ Mag 5
Female lyretail anthias, eyelash blenny, tomato clown, saddleback clown, firefish goby, 2 sand-sifting stars