Well there are 3 AKs and 1 VK in this tent and im guestimating 2.5-3 oz's off each AK and probly the same for the VK. Although the VK looks like it may go close to another 3 weeks. And your 400 should produce some quality buds.. and honestly its not what youve got its how u use it.. Im sure if u put me in DR DRE's studio to make beats and put him on my laptop with a basic production program he would still pump out more hits than I.. Same Idea.. Just maximize the use of your light.