Thanks DC42, makes me feel a bit more at ease with what I'm planning on doing, sorry for the late reply, I have about, or exactly 16 other deadlines in the next 3 months before starting this so I'm a bit busy haha!
o_lampe, this sensors needs to fit within an existing camera system, it's all well and good recording light falling on an object, but the light that hits your screen from objects in a room wouldn't be focused (so i wouldn't worry - you'd be upside down too), and as light waves are destructive, you screen has anti glare technology, cheers for the brainstorming though, but I need complete control of the light here, so it's going in the back of something like this...
Infact... you may of just saved me a load of time here o_lampe because i've just realise that these cameras are upside down and probably back to front, so I'll have to read bottom right to top left and then write the reverse - could make things fun...!