Ive had this watch for about 4 years now, and NEVER had a problem with the light coming on randomly.  This has been dropped, stepped on, rocks hit it...etc and it work like a champ!  Its probable the best watch I have ever owned for this price.  The super bright led light have saved my life "literally" the strap still looks new.  I would definitely recommend this watch to anyone who is a hard worker and works at night.  Super bright blue light comes on when you need to see the time.  I get asked about this watch all the time.