Trailing Edge vs Leading Edge: Which Dimmer Method to Choose Feb 26, 2026 0 658 Short answer: Leading edge is the standard TRIAC dimmer — it opens the load in the second half of each AC half-cycle (best for incandescent bulbs and heaters). Trailing edge is a MOSFET dimmer — it op... ac-dimmer Arduino leading-edge LED MOSFET trailing-edge TRIAC tutorial Read more