I've been experimenting with home hydro/aeroponics the last few months and learnt a lot. It is amazing when you bite into your first self-grown tomato[0].

I am however surprised that grow lamps, even if LED based, are economical for these guys. The retail price for one of those Valoya B100 [1] LED bar is around £700. Plus around 100 Watt running for 16 hours a day. This might make sense if you're growing weed in your basement[2], but probably not for veggies. Perhaps London's crazy prices and lack of space to put a greenhouse in make it economical though.

[0] Picture: https://lh5.googleusercontent.com/-YD-C9M32TbI/UvFqtQg6TYI/A...

[1] http://valoya.com/products/33-b-series

[2] Apparently the most popular use of home hydroponics, and if you research anything about it, you will inevitably come across a huge gray market around this. Also a lot of gardening advice ranging from useful to mythological.