Enough light?

probably not for a "couple" of plants, you need to work on approx 50 watt/2500-3000 lumens per sq foot.
good luck

 

hardly noticeable.
maybe 5 dollars a month on full time

 

you need more then 2 33 watt bulbs for 2 plants. if you want to do it right then go to home depot and get 2 4 foot shoplights and 4 tubes you will be all good to grow its cheap ez and it works.
being 4 feet wide it should be ez to fit 2-3 plants under it but they will be growing under 160 watts which is a good thing.

a HPS is much better but for the cost, floros get the job done.

 

COST -
Most calculations of power usage is as follows:
1000 watts usage per hour = 1kwh and depending on the your local rate for this example 10 cents per kwh you are going to pay $.10 per hour at 24 hours usage you are paying $2.40 per day X 30 days = $72.00 plus taxes

The only other issue is voltage because the above is using 120 Volts. It your using 208-220 it will double. Also in commerical applications you could be using 208-277 single, double or even 3 phase.
Thinking in terms of 120 Volts being single phase you would have adjust the cost factor to double or triple the costs factor and also adjust using 120 Volts as a baseline for the voltage.

A 3 phase 277 volt usage would be 30 cents per hour or about $216.00 per month BUT that would be about 3000 watts of usage not 1000. If your system we 300 watts at 277 3 phase the cost would be the same as a 120 volt 100 watt.

Hope this helps. LOL