The AL40-R fits nearly all marine ceilings, is easy to install, and has B0 and B15* fire ratings. (M) versions are marine approved. Robust steel housing is powder coated white RAL9016. Adjustable swing arms are included up to 52mm ceiling thickness. Diffuser IP44 in high quality Micro Prismatic (MP) or Opalic (OP) Polycarbonate. Silver Matt reflector optics (SM) for very low glare and modern look. Emergency versions with External Battery 3h (EB3). Short version possible with Internal battery (E3). Charging indicator under the diffuser. *B15 Fire rating requires extra insulation