There are pro and cons to leaving the LED *on* a PIR after you walk test it and leave the installation.
Honeywell wireless PIRs specifically state to turn off the LED after the walk test to conserve battery life.
The LEDs do get annoying for the occupant, especially at night when you just want darkness and watch TV. A PIR in the master bedroom with a bright light is downright annoying.
The LEDs reassure the customer the damn thing is still working. Less service calls?
The LED can "tip off" a potential burglar (think inside job at a retail establishment) to blind spots. He has time to study the protected area and it's no coverage area with the LED on.
So......
The big question:
Do you leave the LED on or off in an ideal installation? The Cx will know you turned it off - so leave instructions to walk test it with the keypad for them.
Personally, 99.5% of my hardwired PIRs were left with the LED on. I'm thinking it may be better to turn them off for the annoyance factor and someone able to "case" the joint.
What say you all?
LED on or off?