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LEDs are only more "efficient" when they cut spectrum. People used to think that this spectrum was not necessary, but this has never been true and more and more folks are changing their thinking - this why so, so many have added in T5 lighting to bring a lot of spectrum back.
You live in Canada - you should have no issues with heat. It is probably a complete blessing. I am in Colorado and other than 2-3 weeks in July where it can get really hot and I need fans, the halides allow the heaters to work a less. Unless you have a tight canopy, then heat will not be an issue for you. Most folks outside of Arizona, Florida and some parts of Cali can handle heat with simple fans.
If you pick a MH that has a good color, you don't need to run any T5s which can save some money in purchase, watts and bulb replacement.
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