1. Before installing the bulb, shut off power supply at the circuit breaker panel to avoid electrical shock. It is recommended that surge/lightning protection be installed. Ballast must be bypassed if present. 2. Remove old bulb. 3. Screw new bulb in clockwise. Do not overtighten. Overtightening may cause damage to the light. 4. Individually pivot each of the 3 adjustable panels down to best cover the desired space.