Smart [3] Plus is the version of watertight LED ceiling lights belonging to the Smart [3] family, suitable for installation contexts from 2 to 9 meters and capable of replacing high flux and low bay fluorescent lamps up to 10,000 lm. It is a highly performing, reliable and long-lasting fixture, also available with integrated lens and medium beam (50 \u00b0) light distribution. It is based on a new generation of LEDs with a Flip Chip structure, which improves its mechanical resistance thanks to the absence of wire bonding connections. Inside, the PCT plastic reflector with titanium dioxide metallization prevents sulfur contamination typical of silver reflectors and therefore guarantees stability of performance over time. Like the rest of the Smart family [3], the Plus versions include luminaires made in 3 sizes (800 mm, 1200 mm and 1600 mm), suitable for applications in installation contexts at low heights (below 4 meters) and capable of replacing all versions of linear fluorescent watertight from 18W to 58W, both in the single-lamp version and in the two-lamp version. The entire series is made of polycarbonate and is available in versions with transparent or opal screen, in three color temperatures (3000K, 4000K, 5700K) and two types of color rendering of light (CRI> 80, CRI> 90),