Many players don’t even notice these two lights at the top of many slots, sometimes called candles, which are out of the way enough to not disturb players but can provide useful information to slot technicians and other team members.īecause these lights are standardized across manufacturers on casino floors throughout America, it’s not really a secret as to what they indicate. Most of the time they’ll point to the top of the machine to indicate the reason they came over was a blinking light, in this case an indication the service button was hit. If you’ve played slots long enough, you’ve probably seen a slot attendant come up to a player (perhaps even you) and ask if there’s a problem.