A.T. Robertson Commentary Acts 20:8

"And there were many lights in the upper chamber where we were gathered together." — Acts 20:8 (ASV)

Many lights (λαμπαδες ικανα). It was dark at night since the full moon (passover) was three weeks behind. These lamps were probably filled with oil and had wicks that flickered and smoked. They would not meet in the dark.

In the upper room (εν τω υπερωιω). As in 1:13 which see.