What it means:
A light fixture has a bulb with a higher wattage than the fixture is designed for.
High. The bulb’s intense heat can scorch or melt the socket and insulation on the fixture’s wires, which increases the risk of arcing — sparks that jump through the air from one wire to another — a chief cause of electrical fires. The damage to socket and wires remains even after the bulb has been removed.
Stay within the wattage limit listed on all light fixtures made since 1985. For older, unmarked fixtures, use only 60-watt bulbs or smaller.