[FotoPlasma]

There's a miniature dial you can turn to change the sensitivity of the optical sensor. Theoretically, if you had multiple optical sensors directed towards the same area, you could determine the intensity of the light which you're viewing with a very crude resolution. The kit comes with three optical sensors, so you can have three different intensities of light to measure, in theory.

Keep in mind that I have not tested this at all, it's just a thought that's floating around in my head, and this seemed like the best place to share it.

<edit>

But alas, this is not a photosensor. It is measuring whether or not it can see (for lack of a better term, at the moment) the reflection of its own emitted light.

This post is entirely irrelevant, and should be disregarded by anyone interested in programming for the optical sensor.

</edit>