The power collected from one unit is enough for around 2 hours of light each day :) I think if you double it and connect two of these together, you could have 4 hours then (and so on! xD). Which means that 12 of these plants in an array could bring 24hours of light. And with 24 of them you could have 2 lights in a big room as medium light source for a whole day. Or if you cut it in half (only 12 hours of light) you could do with the 24 plants double the lights (4 instead of 2 then! xD) with 24 plants :D So 24 plants could serve 4 led lights for 12 hours of light. This is enough to have light in a bigger room for the whole night :) And at the same time you can grow vegetables (these plants!) xD