Air cooled light shakes

High guys got a question for you all that I need help with. I just finished setting up my grow box I have a 400w light with a air cooled reflector and a vortex 6" fan. The problem is that the fan is so powerful that its shaking the light even at half power (i have a control switch for it). So I was wondering is this ok? The light does not hit anything when its shaking but its shaking pretty good and it kinda scares me. Oh and I cant turn down the fan anymore or temp will get to high. So any tips or help would be very appreciated. Thanx in advance