Because metal halide bulbs are omni-directional, the bulb gives off light you never end up seeing because it is trapped bouncing around the inside of the area light fixture. On the packaging, this light lost to "Lumen bounce" is still included in the initial Lumen rating. Because LEDs are naturally directional, there's no light trapped in the fixture. This means an LED pole light fixture can be a direct replacement for older systems even if on paper it doesn't look as though the LED area lights put out as much light. In order to help you find the closest actual Lumen replacement, we've listed the wattage range of similar metal halide fixtures under each Lumen range.