The Luminos is a simple solution for teachers who need the ability to write and erase throughout their presentations in small sized classes and training rooms with dim lighting. Features include. Highest quality triplet lens housed in dependable open head container. High/Low switch for brightness vs lamp life. Lamp changer for uninterrupted use if lamp burns out during presentation. Rugged Steel/ABS plastic exterior withstands knocks of daily classroom use. Break resistant glass means less classroom interruptions and repairs.