Patent ID: 8648550

Claim:
A method comprising: (a) obtaining first measurement information A, wherein A is indicative of a brightness within a room when both a first group of lamps and a second group of lamps are off; (b) obtaining second measurement information B, wherein B is indicative of a brightness within the room when both the first group of lamps and the second group of lamps are on; (c) obtaining third measurement information C, wherein C is indicative of a brightness within the room when the first group of lamps is on and the second group of lamps is off; (d) setting a first threshold value to be (B−A); (e) setting a second threshold value to be slightly larger than (B−C)+(B−A); (f) obtaining fourth measurement information D, wherein D is indicative of a brightness within the room when the first group of lamps is on and the second group of lamps is off; (g) determining that D is smaller than the first threshold value and in response to the determining of (g) causing the second group of lamps to be turned on; (h) obtaining fifth measurement information E, wherein E is indicative of a brightness within the room when both the first group of lamps and the second group of lamps are on; and (i) determining that E is larger than the second threshold value and in response to the determining of (i) causing the second group of lamps to be turned off, wherein the determining of (g) and the determining of (i) are performed by a device, wherein the device can cause the first group of lamps to be turned on and off, and wherein the device can cause the second group of lamps to be turned on and off.