Do you mean to use a air cooled reflector to exhaust lamp heat and air exchange?you could,but your open reflector will attract dust and airborne particals as well,some of which will be trapped in the foilage and coat the bulb,that will hinder some of the light output and the plants ability to absorb fresh air,I would use seperate fans,one for the hood with the lens on(the lens protects the bulb from dust and contains the heat)the other for air exchange(a 148cfm for each will work fine)
bonbon Reviewed by bonbon on . HPS Heat Dynamics For all those experienced with HPS lighting, I would like to know, is there a significant difference in heat output between a 250/270W and a 400/430W HPS light? The room is 6.5 ft. long x 7 ft. tall x 3 ft. wide (approx 137 cubic ft.) Would it be sufficient to install a 4" 148 cfm exhaust fan to control heat or would the light need to be air-cooled? Thanks for all help. Rating: 5