You have a supply and demand problem.
Most solar cells will not produce much power under 20W Fluorescents.
Take a typical cell and place it under your lighting. Measure the
output voltage and current. Use Ohm's law to determine how many solar
cells you will need. A typical Beam photovore requires a 3-4V and
To run around your living room, assuming carpeting and the like,
you'll likely want more than a photovore. These require smooth
surfaces. Perhaps a turbot or a walker would be more appropriate. Of
course, these types of robots use motors with higher power demands.
You may want to consider using batteries.
Hope that helps,
J Wolfgang Goerlich