Will a 100 watt corncob light be a good replacement for a 400 watt metal halide?
A 100 or 150 watt led corn cob light bulb is a good replacement for a 400 watt metal halide in most cases. The main thing to consider is the size you have to work with inside of the metal halide fixture. Measure the inside of your existing fixture, then check the dimensional drawing of the LED corn bulb found on the
specification sheet before ordering, so you're certain the corn cob bulb will fit inside of your existing fixture.
Don't forget to bypass the metal halide ballast before screwing in your new LED corn cob bulb.