I have a grow box 70cmx80cmx2meter Length.a 400w MH with cooltube 12cm and for cooling my lamp and my room i bought this fan https://www.intax-hvac.com/vortice-lineo-150-vo-in-line-duct-fan-251p
550m3/h.I've tryed several ways to cool my tube down but no result. 10cm away from lamp the temps...
