insulation/reflector

so i decided to browse the home depot website to see what i find i came across insulation foil that says it reflects 97% radiant energy which sounds pretty good and it's cheap as
hell! http://www.homedepot.com/webapp/wcs/stores/servlet/ProductDisplay?storeId=10051&langId=-1&catalogId=10053&productId=100656748&N=10000003+90401+531843
what do you guys think?

think radiant energyis more heat then light. Not sure try this link.
http://similarads.pl/Energy/radiant_energy.html

yea basically it leads to heat...thanx a lot man! appreciated!