A 250-watt metal halide requires 9,000-12,000 LED lumens for equivalent light output, while 400-watt systems need 15,000-25,000 lumens. For 1000-watt metal halide replacements, choose 35,000-50,000 lumen LED fixtures. LEDs' directional light output means you can often achieve better illumination with lower lumen ratings than the original HID system produced.