I am thinking of purchasing a RLC 811A , and would like know if the LED light power is adjustable ?

RLC 1212 A . At night the detection of persons has deteriorated over the last 4 weeks that i have owned the camera.
It records cars no problem at 48% sensitivity . The person motion sensitivity is set at 100 % and now does not detect 95 % of people.
It detects me coming out of the house ( when dark ) to get my morning paper , but not coming back.
Also i can view live in " clear " . But recordings are in jerky slow motion , except in " fluent "
I'm viewing using client version 8.8.5 for windows.
Can anybody help please ?
Ken

1212A live viewing and playback set 1x plays at 1/2 speed !
Can anybody help please.