These 8" Cool Sun XL air-cooled reflectors would be right at home in these indoor garden set-ups. The 8" duct ports allow extra air-cooling potential when linked with an 8" inline extraction fan.
Remember, for air-cooled lighting to really bring you all its potential benefits, the source of air used for the cooling must be ... you guessed it ... cool! Ideally draw the air from outside of the garden, using a dedicated source / flange. That way you can separate your garden's environmental / air-exchange needs from your air-cooled lighting, meaning supplementing with additional carbon dioxide, for example, is a whole lot easier and feasible.