The most annoying part is a ~2-4Hz regular-looking oscillation, with up to +-0.5V of amplitude at output. That one happens on a breadboard as well, with no extra wires.
It's not in the light or surroundings - happens from many lightsources and in many places, don't happen in none.
The "no detectable noise" part was about full darkness and near the upper limit.
Have i missed something again?