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I see, thanks!!

Thanks for the links!

Why not just use 277--if we can get more wattage, or voltage amps? I guess install three phase on residential houses id ridiculous!

Sorry, I mean output.

I see! I was told (Dad--is an electrician. He has me researching, so I can have a better understanding of my venture) you could use input to calculate HID's?

That comes to 265.58
I just tried 480/1.732, and it came to 277.
Still doesn't make sense On why 277? Lost!

Really! That's interesting. Looks like you get more out of three phase than single. May be best to have everything 3 phase!

Another question: How do you get 277 from a 3 phase transformer. I...

How do you calculate wattage for 277v's?
Is it the same as 277(15A)=4155 watts (If the amps is 15)
If so, does this mean if I wanted to supply 150w (output) HID light fixtures that are 277v, I...