Goodbulb's GBLEDACORN10W5K20 watt LED acorn light bulb offers optimal energy efficiency (up to 75%). Perfect solution for bypassing metal halide or high pressure sodium ballast. Quick and easy to install, these LED acorn bulbs have a standard Medium E26 screw base. Long lasting with a 50,000 hour life based on 4 hours per day. IP65 rating ensures complete protection from dust, oil, and water.