PrevaLED Flat AC: round LED boards 170 mm and 240 mm in diameter with the driver integrated on the board, for wall and ceiling luminaires with diffuse light. They are a simple LED replacement in compact-fluorescent luminaires for corridors, stairways, landings and hallways, in 3000 K or 4000 K, and come in DA, PC, EM, MA and SL versions, including one for single-battery emergency lighting.