[Scooterman]

Homes of the past was wired using smaller gauge wire, that had lower current limits, I guess at the times they could never imagine the need as in our modern lives. Typically today 14g & 12g is the standard, 12 gauge is in the majority of homes. With this wire NEC limits usage to a 20A breaker but it could be a small as 10A. So depending on your wire gauge & breaker, you may be able to split the load across the two outlets. Seems like allot, I have a 350W heater, 280VHO, 250MH, & a series of pumps on one outlet. That will change soon when I move the tank. What I did was add the total amperage of everything plugged in, including whatever else is on that circuit, like lights etc, I try and keep a 75% limit on a breaker, which means at worst case of everything starting up at once, the total load would be 75% of the 20 amp breaker, actually, when equipment is running it is considerably lower in power consumption. Also, my heater hardly ever comes on, don't know if I even need one typically, I also use electronic ballast which are efficient in power out to power loss ratio, which also lessens the load on a circuit, and wallet in the long term.