A lighting system includes a support frame having first and second spaced-apart parallel elongate support channels and one or more elongate arms spanning and rigidly connecting the channels, a plurality of elongate electrical light emitters spanning the channels perpendicular thereto, having connectors at first and second distal ends thereof, and connected to the channels by the first and second connectors, respectively, wherein the connectors are adapted to allow movement of the light emitters along the channels while maintaining the light emitters perpendicular thereto.
