Outdoor Motion Sensor Equipped Floodlight

2010.06.25 D5

Motion sensor equipped floodlight is priced according to the sensitivity, or the angle of view the sensor able to detect.

Here is an example of prices I found at local Walmart store,

$25 for a 240 degree
$18 for a 150 degree, and
$12 for a 100 degree equipped sensor. Of course, the light bulbs are sold separately.

I didn't find the "field of view" in the up and down angle in the specification. Can someone - turn around the corner and walked close/along the wall, and never trigger the sensor because it is mounted 15 ft above?