Do refletor heat shields work?

I'm in the process of setting up my first grow tent. It's 4x4x6.5 with a 600w air cooled light and a single 500cfm inline fan. You can see my whole setup at this thread: https://www.rollitup.org/grow-room-design-setup/503163-why-my-grow-tent-so.html

I've managed to get the temps down a few degrees but I'm still getting hot spots 18" under the light as high as 84. These heat shields seem promising: http://www.ebay.com/itm/Heat-Shield..._0&hash=item4cf4a96b8b&x=11&y=7#ht_1205wt_909

I've only found a couple reviews of these but they seem good, almost to good, one claimed to drop the rooms temps by 10-15 deg. Does anyone use these, and will it actually keep the room cooler? the air temp in my tent near the ceiling is only around 73-74 but as I say under the lights its hitting the low to mid 80s. If it will drop those temps down 3 or so degrees I'd be happy.

No one tried these? I'm really just wondering if it will help with the radiant head from the light...

IMHO, your light looks like it is an air cooled hood. If so, wrapping it up in an insulation wrap will only increase the heat on the bulb.
Again, IMHO, you need more airflow through the lamp and also in the tent.

Dirty Harry said:

IMHO, your light looks like it is an air cooled hood. If so, wrapping it up in an insulation wrap will only increase the heat on the bulb.
Again, IMHO, you need more airflow through the lamp and also in the tent.

Click to expand...

Well my thought was that the shield would hold the heat inside the hood so that more of it would then be pulled through the ducting out of the tent. I'm not to concerned about the temp of the bulb with the light being air cooled, the top of the hood and the lens stay under 80 deg. You may be right about a lack of air flow though. I calculate that I am getting around 2-3 hundred CFM (could be wrong). The thing I don't really understand is how increasing the CFM is going to reduce the radiant heat from the light more than the air in the tent (convection heat). The surface temps under my light are 10-14 deg higher than the air temp which is the same as the surface temp out of the direct light. Does that mean I would have to get the air temp down to 62-66 deg to get the canopy temp down to 76?