Power usage

[Wet Paycheck]

Through my primitive understanding of electricity. It would seem to me that a 400w heater and a 400w mh would consume the same amount of electricity. Is this ignorant?

 

[just_tim]

Its all about amps. Wattage is just output. And that's the extent of my limited knowledge.

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[Fourthwind]

Watts divided by volts equals amps. So yes in theory they consume the same amount of power given they are running the same amount of time.

 

[halmus]

The 400w heater is going to be kicking on and off during the day which makes measure average power consumption over a period of time a little harder to calculate vs a MH light being turned on for "x" hours a day.

If you're just trying to figure out loading (will the circuit support this device) I would imagine that they draw roughly the same current based in the same wattage rating. However, I've never actually hook up a meter to verify my 250w heaters actually consume 250watts.

They sell cheep meters at hardware stores called "kill-a-watt" meters that will tell you what the current and wattage draw are for plugged in appliances. That might be worth investing in if you need hard numbers.


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[Wet Paycheck]

The 400w heater is going to be kicking on and off during the day which makes measure average power consumption over a period of time a little harder to calculate vs a MH light being turned on for "x" hours a day.

If you're just trying to figure out loading (will the circuit support this device) I would imagine that they draw roughly the same current based in the same wattage rating. However, I've never actually hook up a meter to verify my 250w heaters actually consume 250watts.

They sell cheep meters at hardware stores called "kill-a-watt" meters that will tell you what the current and wattage draw are for plugged in appliances. That might be worth investing in if you need hard numbers.
You are right, I am figuring load. I am disconnecting a heater an need to replace it with a light. Running close to max cap with heater going. Just wanted to make sure. Thanks guys

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