If at all possible could you add footcandles?

First of all, I would pay $0.99 or $9.99 for this app all day, everyday. Second of all, to provide more information to agricultural/ horticultural users could you add foot-candles to the 'sunrise', 'specific time' and 'sunset' readings? Any other way you might be able to think of adding a reading for the amount of sunlight available would be incredible.