X10 Lux rating is super high, and you'd need to be standing on the Sun to get a decent picture.
I used to do tech support for X10, and have come across some really good wireless security cams.
Check out:
http://www.smarthome.com
They have some higher end security cams. Very low (0) lux ratings, almost see in the dark.
Anyhow, if you have any questions about X10 just let me know, and I'll see if I can answer them for you.