Metal halide lose a lot of light over its 5000 hour life.
Led replacement lamp for 400 watt metal halide.
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If the initial lumens produced by each 400w metal halide fixture were 30 000 you should get led fixtures that produce 30 000 lumens.
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To replace a 400 watt metal halide you will need abotu 18 000 lumens.
When getting led fixtures the most important thing you should look at are the lumens each fixture produces.
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Edison lighting supply shows you how to retrofit 400 watt metal halide lamp for led.
A metal halide light that produces 30 000 lumens discharges 75 lumens per watt.