HID high bay lamps reimagined in LED - Reduce maintenance and energy costs with a simple upgrade. These high bay lamps replace 200, 320, and 400W models with far more efficient LED technology. An integrated heat sink dissipates heat quickly without the need for an on-board fan, and the unique design provides 20% uplight which eliminates dark areas on the ceiling known as the "cave effect". All high bay lamps are designed to handle the heat of closed spaces, so they can be used with confidence in both open and enclosed fixtures.