Hi,
Re: Leggy plants
correct me if I'm wrong agapanthus , but I think you mean put the seedings on the windowsill (south facing if possible) and the foil behind them (the shiny side facing the window pane). So effectively you have the window pane, with the seedlings on the window sill and finally the foil reflecting any light coming in from the window.
Alternatively, you can use two 40-watt, cool-white fluorescent tubes.
Hope this makes sense