Not really sure.....I think they'd be ok as long as they don't get beat up by the sprinklers directly. I see them get wet, but they still work. Maybe just get 1 first and experiment?
Just picked this up from Costco ($30 for 8 at ~$4 a pop). It is glass, so better quality and heavier then the all plastic ~$3 ones at Lowes/Home Depot. So far so good.. when it lights up, it does cast a distinct pattern on the ground (kinda like sun rays). Some people might not like it.. Might go back for another box.. cheap quality lighting.