Cheap but good skylite?

OK So we have blown the budget and can no longer afford the Velux roof windows but we need some extra day light in the kitchen.
The new kitchen area is 4000 wide and 6000 long
We only have the one small East facing window 900*600 and the South facing glass door 2100*1000, even tho we borrowed light from the openings into the lounge and work room , the area where all the work will get done is just a touch short on natural light
Main query is how small can we use and still have enough light ?
Will 2 small ones be better than one much larger one?
Bunnings had small round skylights for $99- a while ago but it seems the next size up jumps to $300-


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