LED Corn Light E39 | 80W to 300W Retrofit for High Bays and Shoeboxes

One lamp family, 80W to 300W

A corn lamp screws into the mogul socket of a fixture you already own and replaces the metal halide or high pressure sodium lamp inside it. The housing, the pole and the wiring all stay. That is why retrofitting a site takes an afternoon and a lift rather than scaffolding and downtime.

The range runs from 80W to 300W, so one part family covers a low bay, a shoebox and a high mast.

Matching the wattage to what you are replacing

The ratio is not fixed because the old fixture's reflector and lens have usually lost efficiency over the years. Fit one, stand under it at night, and set the rest of the order from what you see.

Specification

The ballast has to go

Most corn lamps need the existing ballast removed and the lamp wired direct to the supply. A ballast built for metal halide will damage an LED lamp, and this is the step most often skipped on a rushed retrofit. It is mains wiring and belongs with a licensed electrician.

Measure inside the housing

A corn lamp is longer and wider than the lamp it replaces, and the difference grows with wattage. A 300W lamp will not fit where a 100W one will. Open one fixture and measure before ordering a pallet.

Enclosed fixtures trap heat

Corn lamps shed heat along their fins. In a sealed shoebox or a wall pack with a shallow lens, that heat has nowhere to go and the lamp dims early. Confirm the lamp is rated for enclosed use before fitting it into one.

Related

For sideways sockets see our horizontal corn lamp. For new fixtures rather than retrofit, see high bays and shoebox area lights.