GELcore aka GE Lighting aka current powered by GE model of traffic signal light designated DR6. This is documentation of units pulled from roughly a decade of active service.
As of 2013 GE offers it's 14th version of it's LED based light bosting over 6,000,000 sold world-wide
These were previously developed to conform to NEMA TS-2-1992, or the second revision of teh "Traffic Control" standard "TS-1", "TS-2" has since been updated, and super-seeded.
Inside of dismantled green arrow unit https://photos.app.goo.gl/PPONnfMPILU6VcAV2