i have a 400w hps running on 12/12 cycle in my first week of flowering and i have a little portable heater...pic at the bottom.

The problem is, wen the heater is running the light wont turn on. If i have the light on and then turn the heater on, it turns the light off. This is a big problem because its getting cold and my grow room is under my house susceptible to the cold weather....WHAT CAN I DO TO FIX THIS???

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You can run an extension cord from another electrical outlet to your heater. Pretty easy fix.

You need to pull the heater load from another circuit. Finding a new circuit may mean running an extension cord from somewhere close in the house. You can get an inexpensive power meter to see if you are getting a voltage drop on that circuit with one of the two on, if that's the case, don't put too much load on it, as you have already found out. I don't think I would ever put an electric heater on the same circuit as the lamp, just as a precaution. Electric heaters draw just too much power.
I would consider the heater a temporary solution, if you have a stable, cool environment ( like a basement or so ) the best way to get more heat is with more light.
Ideal fix : add a new circuit and light the place up.

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The minister

ideal fix, get another light for heat i like that.

okk. its in 12/12 cycle and during the dark period the temps in there are like 62-63F. I already have the heater runnning from a different extension cord and its on a completely different outlet up in my room. It still has the problem as if the heater is taking up so much power. I have a hole in my floor where the cord is running so the only outlets i can plug it into is my room. But they are on different outlets. I really dont know what to do, its flowering time and the plants look great, i dont want to waste my whole grow just because i couldn't regulate the temperature.

the outlets in your room are probably on the same breaker. if so tthats what's tripping it. usually in a room all outlets aren't on the same breAker. could be in your case which means you need to find an outlet that isn't on a breaker with a ton of watts being used. try extension cords to outlets not on the same circut.

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The musicians today who don't do drugs and in fact speak out against it? "Rock Against Drugs?" BOY do they suck.

and use grounded extension cords. 13 gauge would be good.

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The musicians today who don't do drugs and in fact speak out against it? "Rock Against Drugs?" BOY do they suck.

extendsion cord to the other end of the house will do the trick