reflective foill help

hi i was searching on the b&q website and i found some reflective foil for behind radiators and was wondering if it was good to use in a grow room , veg box etc ?

i was reading about diffrent stuff to use as i was going to use emergency blankets and found out there not as reflective as i thought lol so looking for better stuff .

can anyone give me any help with this what is better the blankets or this stuff i found ?

the link is below .

http://www.diy.com/diy/jsp/bq/nav.j...ories<{9372050}&fh_refview=summary&icamp=ns_7
 
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