id reccomend covering the sides of that bench with some black and white poly (panda film) and using maybe 4-6 48" fluorescent tubes that will give you about 10,000 lumens of light and virtually no jump in electric bill ( ive got 6 tubes running 24/7 and my bill actually went down last month) you could veg maybe 6 indica plants in that space to about a foot tall or so.. it wouldnt be suitable for flowering tho....