Watts are indeed a measure of magnitude. Kilowatt HOURS are a rate (that's what the 'hour' part is, usage/time).

In any case, there are about 720 hours in a month (30-day month). So if you ran your 1k light 24 hours a day, that'd be 720 kilowatt hours. If you want to stay below 3000 kilowatt hours, then you could use as many as four 1k lights running 24 hours per day (but basically nothing else).

If you're using just one 1k light 16 hours/day, that's about 480 kilowatt hours, leaving you 2520 kilowatt hours for other stuff throughout the month. That comes out to about 84 kilowatt hours of 'spare' (non-light) useage per day, or about 3500 watts of constant useage. Since some months do have 31 days, you'd probably be safest using no more than 3000 watts on a constant basis (plus the 1k light 16 hours a day).

Check my math, but I believe that's correct.
jamstigator Reviewed by jamstigator on . how does a 1000w light relate to electric bill? i am trying to figure out how the wattage of my lights will relate to my electric bill. a know a 1000w light uses 1000watts but over what period? The ultimate goal is to keep my usgae below 3000KW hours per month, thus keeping my electric bill in a normal range. i know it will vary depending on lighting schedule but can someone tell me how to calculate it? I know it must be simple. Rating: 5