How much would it costs per month too run a 450 wt light

[monsterkilla]

hi there, was wondering how much would it cost per month to run a 450 wt hps 18 hours a day. i was thinking 50$ a month.

 

[Icemud]

take your wattage 450w and divide it by 1000...That is your KW

Then take your KW and multiply it by how many hours per day your using your light..

so for you..... .45 x 18 = 8.1 Kilowatt hours per day...

now take your 8.1Kw/h per day and multiply it by how many day's in a month...

8.1 x 30 = 243.... So per month that light at 18 hours per day is using 243 Kilowatt hours...

So you have to take this number 243 and multiply it by your electric rate per kilowatt hour... so for instance..

if you took 243 and multiplied it by (.18$ per kilowatt hour is what I pay) that light would cost me $43.74 per month to run...