Air cooled tubes inefficient?

I am looking to buy an air cooled HPS light. I was looking to purchase an air tube, but according to Cervantes, they are extremely inefficient, and create a bunch of hot spots. So then I got thinking, what if I placed a Gavita bulb inside of the air tube. For those of you who don't know what a gavita bulb is, search for them online, they are crazy. In short, they have the reflector built inside the bulb, reducing the distance the light has to travel before it gets reflected, increasing efficiency to a stated “95%”. So my question is, will using this bulb inside the air tube reduce the inefficiency of the tube, or is it the concave shape of the glass that refracts the light which makes tubes inefficient?

 

thanks for the responses. How many cfms do yall think i need for the fan?