Most people go for ATI. I have used them before and found them to be very good. A popular bulb is the blue+ as it has huge PAR and a really nice colour to make corals glow.
Giesmann and KZ bulbs also have a good rep but tend to be a little more expensive.
There are a number of canadian retailers online that sell these bulbs. Also BRS in the states has pretty good prices. I've even had luck on eBay with them too.
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