The Decade 800 series has 2 lightbulbs so I would definitely think that your Decade 80 would be the same.
I had a tan Decade 80 in the past and I'm 95% certain that unit had 2 headlight sockets. This makes me wonder if the motor on your unit was replaced???
Actually no the motor was never replaced. I double checked and I was wrong, it does have 2 sockets so I ordered another LED lightbulb right away a couple of days ago.