well ill just say my outside air temp is the same as yours probably is just a guess!!!! HeHeHe This set up is good for the MH right now but as for the hps im in the process of making a cool tube.
1. 6" booster furnace fan $27.99
2. 6"x4" reducer $4.89
3. hurricane glass $6.00
4. foil tape $8.30
5. dryer duct $6.46
6. keeping your hps so cool you can touch it PRICELESS!!!!!! LOL