Night Vision gained from TL8 (bio)chemistry (P:ES?)

[vicky_molokh]

Greetings, all!

So, mad scientists rejoice, even though it seems like it's a bit early to celebrate. Still, any estimates on how much Night Vision [0] it provides while active?

Assuming that the enhanced person saw/identified 100% of objects, while normals identified about 33%, at 50 yards, here's my rough estimate:
Vision 10, Plain Sight +10, 50 yards -8, 3 levels of darkness for -3, netting a roll against 9 (about 37% success rate). That's for normal people.
Getting 3 levels of Night Vision would up the roll to a 12, for a 74% rate of success, at which point there is no more NV to be had to compensate penalties.

Seems a bit underwhelming for 'from 1/3 to 100%-ish'. Perhaps more of a darkness penalty is a factor?
Thoughts?

Thanks in advance!