July 20, 2016 – Columbia Lighting has launched a LED version of its Zero Plenum troffer for restricted plenum spaces: the LZPT.

For installation, the patented telescoping housing requires only 3 in. above the ceiling at one end of the fixture, Columbia says. Once installed, a housing height of 1.5-in. keeps the fixture from intruding into the useable plenum. It comes with four LED colour choices.