Help Me Build My SUBPANEL? Electric Question?

I am having an certified electrician make me a 125 amp Subpanel that will be attached to a piece of Plywood that has a cord to plug into the existing subpanel. The electrician is also installing the socket from the 200 amp service to plug into. I am looking for some experienced help in building this. I have listed below what I need this subpanel to be capable of. I have 200 amp service in the house already. All of this is not going to be ran at once, some during veg some during flower but I would like the capability to run it all. Also I know several smaller things like standing floor fans can be plugged into one socket with a power strip. Please help me out. Would be much appreciated.

I want to run

4 x 1000 watt lights
4 x 1000 watt ballast
14000 btu air conditioner (1200 watts)
2 - 724 CFM Inline Fans
3 - Standing Floor Fans
Dehumidifier
Sulfur Burner
Humidifier
Pump for resevoir to water plants

Well the simply answer would be a for a 100A panel (120v devices), x2 30A ports for the lights (2 lights per port) and x2 20A ports for every thing else.

I would set the AC and the dehumidifier up on a tempture control relay so only one is ever running at once (since they both dehumidify).

If you are going to only have 2 lights (ballists) EVER running at once they can share one 30A port as long as the first two shut off before the other two come on. You might even be able to streamline this using flipflops depending on how your setup is.

I talked to the guy at the hydro store and he said anything running 240 the amps are cut in half so if your running your 1000 watt light and ballast which would be 22 amps its only registering at 11 amps. Is that true?

if your running 240 yes basically amps are cut in half 1000 watts/120= 8.3 amps and 1000watts/240= 4.16 amps. since you have more voltage you drop the amps basic watts= voltage x amps. but inrush for halide and hps are are more on starup just like a motor draw

poundpusher2009 said:

I talked to the guy at the hydro store and he said anything running 240 the amps are cut in half so if your running your 1000 watt light and ballast which would be 22 amps its only registering at 11 amps. Is that true?

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I am not an electrician but yes you can run your lights on 240v and use half the amps however you are charged by the watt so at 120v @ 6amp or 240v @ 3 amp (does not matter) the "cost of power" difference is nothing. All it really means is that you can hook up more devices per port on 240 cause it draws less amps.