Originally Posted by kalikisu
hey guys and girls i just wanted to know if the windshield shades for cars are a good reflector. Im know not to use aluminum foil because of hotspots and things. if you dont know what the car shades are let me know and i'll up a flick. i just want to get an opinion. holla
Just because something looks reflective does not mean that it is--foil and mirrors are good examples. I think these things are made to reflect heat, so I would guess that you may be reflecting a great deal of heat back on your girls. As far as reflective materials go, I would stick with what is tried and true. If you cannot afford mylar or Panda film, flat white paint, as King Kahuuna mentioned, is a good choice.
If you do not have a reflector on your HPS, you are losing over 50% of your light.