GTI GLL-432e Overhead LuminaireGLL 432e Overhead Luminaire The GTI GLL 432E Overhead Luminaire is a less expensive version of their GLE series. The difference is that the GLEs have built in on off switches, whereas the GLLs must be wired by a qualified electrician. For overhead, unparalleled lighting quality, the GLLs provide even and superb light quality over a large area. Whether you need it for a studio or gallery, this luminaire produces consistent and long term quality