cool down my tent

okay I got very large tent my problem is I got portable ac unit. Inside my tent and it takes up alot space an cost lot money to run 24/7 I got high velocity. Inline fan 6" duct work witch sucks out hot air from my 400 watt mh light an flushes it upstairs. Would one them reflecters that has cooling tube built on to it so could suck hot air right from the 400 watt lamp any one please help me

The key is to remove more air than you take in. First thing I'd do would be to put the A/C outside the tent, then up your inline fan and matching filter game. The goal for me personally is to exchange the air in the grow space once per minute. For example, if your tent is 8'X8'X4' then you have 256 cf of volume in your tent and would need at least a 256 cfm fan/filter combo, but due to drag from your filter and ducting, I try to shoot for 25% more or in your case a fan cable of moving 325 cfm. If you remove the heat from the tent faster than its produced while keeping the outside air coming in nice a comfy, while venting the hot air outside, then you will be golden.