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
Under the hood there is quite a bit of circuitry given that this is a "dumb light" controlled externally by being flipped on and off. This is at the least a complex constant current supply with a fairly high power factor. Later models include compensation for continuous brightness after years of use and environmental monitoring and compensation features.
This particular DR6 Green Arrow did teh job of a single component, a light bulb, with a mere 106 discrete components, 44 of them being actual green LEDs, along with a PCB weather tight case and fasteners. Green LED's are actually arannged as groups of 4 in parallel, wired 11 times in series.
- LM2903N Comparator, Dual, Low Offset Voltage
- MC34262 Power Factor Controller
- STP5NK80Z N-channel 800V 1.9Ω 4.3A TO-220 Zener-protected SuperMESH™ Power MOSFET
- MPSA42 High Voltage NPN Transistor
- TN2404KL 240V N Channel MOSFET
- X2 Capacitors, MOV, Zeners, Diode Bridge, Fuses
Detailed images of PCB, aspect and skew corrected, 1:1 at 300 pixels per inch.
* Note that image (bottom side of board) is mirrored horizontally