I used 600mh HID very diferant than CDM. I use 1 LEC 630 for the main veg tent that holds the large plants. 1 315w for the medium size plants. 1 315 for the small clones seedlings. These run cooler and use less power. Rives knows more then I do. His thread is here.. From what he has posted the 315's are vastly superior to 400's.
https://www.icmag.com/ic/showthread.php?t=299165&page=1
Bulb SPEC
http://www.lighting.philips.ca/prof...m-t-elite-med-wattage/928601167302_NA/product
https://www.icmag.com/ic/showthread.php?t=299165&page=1
Bulb SPEC
http://www.lighting.philips.ca/prof...m-t-elite-med-wattage/928601167302_NA/product