Does light pass through panda film at all... ??

I want to make a grow box but my box medium is very poor at blocking light...

I was either going to line the inside with reflective insulation or panda film...

I know the insulation will block any light from passing through but it is expensive... Panda film looks cheaper and i would prefer it on the inside as opposed to reflective insulation but i have never used it and i dont know how effective it will be at blocking the light...

I dont want my grow box to look like a JeDi GlOw BoX... =]

But i would prefer panda film... =P