Solar Substitute

Do you not have access to a window or roof?

You can use artificial light but it won't give you an accurate representation (unless you use a lot of it and take care to simulate sun movement and cloud cover which will cause the generated power to vary by quite a bit). You may be better off simulating the solar panel output using estimated power characteristics and de-rating factors.

Buy a DC low watt light and wire directly to your charge controller/seq. My favorite supplier is at www.backwoodssolar.com (note woods is plural, so two ss together)

Matt