Installation: GT-C TB-40A | 5200LM/40W LED High Lumen E26 Bulb ® . WARNING: GTQLT SHUT OFF POWER BEFORE Complete LED Lighting Solutions 1% PYRITE 101 TROUBLESHOOTING GUIDE: Problem Probable Cause | Solution Fixture does Bad connection. | Heck wiring connections. Installation: GT-C TB-40A | 5200LM/40W LED High Lumen E26 Bulb not turn on. Faulty switch, Test switch or replace it. Power is off. Verify power supply is on.