boat & motor have to have nav light. red & green. kayaks, tubes, toons or rafts do not need them but it is recommended to have some type of light for at night for safty reasons.
But again this all depends on what shieff or harbor patol that may stop you.
I was stopped not too long in HH and asked them if there was any special requirements needed for tubes and they told me no and the light set up that i had was a pretty good idea.