Need a Mod idea for 4" exhaust hooking up to 6" cooling tube

My grow tent has 4" exhaust holes and I have a carbon filter/fan combo with 4" tubes. The light i would like to get has a cooling tube with 6" intake.

How can I get these two to be compatible with each other? Is there some type of conversion tubing or attachment i can buy?

Can i just use a 6" from the cooling tube to the filter and force it in the 4" hole? Maybe seal it with duct tape or something?

I havent ordered the filter/fan yet either.... Maybe get a 6" there and then just force that out the 4" exhaust hole?

u can buy a sheet metal 6 to 4 inch reducer at lowes or home depot in the hvac section

Thanks guys I really appreciate it!!