The question is will your 250 Watts be enuff to provide ample light to your grow, because for four hours, that is all you will have...

Thats not a lot of light for 1/3 of your entire cycle.....

Why not, to conserve juice, do what I did...

I went through out the entire home and replaced every incandescent bulb with a little tiny CFL. I gotta huge house do I figure I replaced maybe 30 light bulbs.

Now mind you it was an expense at first, but I found these 15W = 40W deals at THD and my electric bill actually dropped during my grow.

I relamped my outdoor lights with dusk to dawn electronic eyes, I made it a point to shut down my PC's, TV's and replaced the wifes electronic vibrator with a gasoline powered one

I worked to offset the juice and it went quite nicely.

You would be amazed at what regular light bulbs can cost over the long run.

I dont remember how many plants you got, but 250W isnt a lot of wattage for anything more than a few square feet worth of plants.