I was strictly going by the specs and didn't want to assume there was any extra to spare. Nothing worse than buying 20 power supplies that can't drive your cobs.
Honestly none of this is very exact, analog tolerances are naturally wide, and running as close to 100% as most people do around here, including me, is probably not entirely wise. MTBF is given at 80% load
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Vf is +/- 3% according to Citizen, +/- 7% on Crees datasheets (from memory). That's a swing of an entire volt in either direction at 3%. In practice I don't know how far they really vary, mine are practically identical, and line up very well with the datasheet.
I wish I could test like
@Greengenes707 but my cobs are within voltage spec, at about 200V on an HLG-120 @ 700ma.
Luckily ventilation is easy to come by for growing purposes, and heat is the real enemy here, as long as the driver is willing to give it the old college try and not fart out.