Ron, there are 2 kinds of motion sensor on the 'bay, mine is the one with 2 pots at the edge of the board, and yes its high when motion sensed.
The chip itself can be configured hi or lo on motion detect, not sure if one of the links on the board sets that, I dont speak chinese either.
The cds cell is one of those little tiny jobbies like you find in a pir floodlight, I think there just the one type, I seem to remember they are about a couple of k at dusk.
Sounds academic now anyways, you left it too late tex.