Richard

Your best choice for most plants are an array of fluorescent bulbs with 6500 Kelvin color temperature. You can buy these in CFL, or 2' or 4' bulb lengths. "Color Temperature" is listed somewhere on the packaging of all fluorescent bulbs. Don't be fooled by HPS etc. bulbs claiming 6500K.

If you want to duplicate sunlight you'll need multiple fixtures of 8 x 4 foot T5 HO fluorescent bulbs placed side-by-side and end-to-end so that the power density (as listed for each bulb) adds up to 1200 Watts per square meter.

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