What light source for indoor ambient light you have (metal-halide lamp, halogen, sodium bulb, neon, mercury bulb,...), and on what distance ?
For solar cells, from personal expirience sun light is more effiecient then any other light source. You need to put solar cell closer to bulb light source to have some results.
In other hand lots depends from what solar cells you have, quality, efficiency, light spectar ?
Solar cells from small solar garden lamps, best works on sun as light source, with artificial light give poor results.
Maybe better consider some other power source.