ok man heres the thing
if your growing in your parents house
stop now unless they are ok with it
if its ok then save your lunch money
go to wally world and at least get a rubbermaid tube for $4
those dont catch on fire
aluminum foil doesnt reflect light it only heats up
mylar or white paint are the 2 things to go with
most people have an old can of white primer wall paint in the attic or shed from when the house was built
ask the neighbor man something
here is the light you want
it will last your for 2 weeks on one plant, the sight says 16 but im pretty sure at the store its 10
http://www.walmart.com/catalog/product.do?product_id=5684723
so for about 20 bucks you have a rubbermaid tub a 42 watt cfl make sure its daylight
i got a 7 dollar fan to move the air around
find some white paint but its not that important if you ask me not till you actually have leaves on your plant
your box is a risk to your house tho
it will catch on fire the alluminum can heat up and the cardboard will start straight up man
i dont advise that at all
i did the exact same thing you did when i first start and as soon as i put a pic on riu a guy told me the same thing
but like a said rubbermaid 4 bucks at walmart
that light bulb sucks tho man i hate to say it find a cfl and the 42 watt will work
look through this
https://www.rollitup.org/grow-journals/170307-1-x-super-lemon-haze-3.html