i have been doing freshwater for many years, the cheapest light for a 30 gallon is to buy a 12" double tube fixture from home depot for 20 bucks... put sunlight bulbs in it, and go. Easy as pie. (Of course he would need a canopy for this.)
buying 2 of these, and putting sunlight/plant bulbs in is enough light to start growing aquatic plants.
"Maybe in order to understand mankind, we have to look at the word itself: "Mankind". Basically, it's made up of two separate words - "mank" and "ind". What do these words mean ? It's a mystery, and that's why so is mankind." ~ Jack Handey