well i found this and i wanted to share it for all the 400 watt low even canopy growers who dont have the cash for 600s+ the space for 600s+ 400s are still very convenient lumens drop by the thousand every inch raised....
Here's the full chart Not sure why but there isn't one single Metal Halide chart that includes 600w, which kinda pisses me off because that's the wattage I use