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Anyone using these see any difference in temperatures? I've used the 40 watters which seem to give off zero heat but the specialty grow bulbs pushing 100+ tend to get pretty hot.

You're actually losing lumens/watt with the 65w bulbs (3900/65 = 60 lumens/watt) as compared to the 40w bulbs (2650/40 = 66.25 lumens/watt). Not a huge deal but something to consider given the extra cost per watt with the 65w bulb as well.