Beercan CFL reflectors! Cheap, easy and effective! Photo how-to guide

UptheDownstair

Well-Known Member
Hey all,

So I had an idea that Im pretty proud of and thought Id pass it along to my fellow growers. Its the least I can do for the wealth of knowledge and ideas youve been giving me over the years.

Hope you like my first how-to guide.

A few starting points: Be very careful when cutting in this project. Aluminum is sharper than a motherfucker and the flashing you get when cutting with sheers or scissors can poke you pretty good. Same goes for when your using the razorblade to cut the side. But this is all standard safety shit that you all know anyway. Just a disclaimer covering my ass.


Step 1) All the tools and supplies youll need to make one: A pair of needlenose plyers, a pair of sheers or scissors (scissors will be harder to use), a razor-blade or utility-knife, electical tape, a small flat-head screwdriver, mylar film (optional), spray adhesive (optional too if you dont use the mylar), scotch tape (also optional w/out the mylar) and most importiantly, an empty beer or soda can. I chose the Keystone Light can because it is slightly taller and narrower than a standard Oly or Coke can, but any 12oz aluminum can will work. Youll also need a flat, clear, elevated work-space like a table or workbench.


Step 2) Remove pull-tab from can and make marks around the opening. The idea is to widen the opening to fit the socket-end of a standard CFL bulb


Step 3) Make each cut with a pair of sheers or scissors


Step 4) Each tab cut with sheers or scissors


Step 5) Bend down each tab with a pair of needlenose plyers


All tabs bent down with needlenose plyers


Step 6) Test-fitting: With the tabs bent-down and the opening widened and rounded, a CFL bulb now fits inside. If you test-fit yours and it doesnt fit, just cut the tabs a little deeper and bend them again. Dont go too far though! The idea is to get as snug a fit as possible.


Cut marks (black sharpie). You dont have to make these marks for yours, I just put them on for this how-to guide.


Marks for the next cuts youll have to make (black sharpie). Notice how these lines dont touch; you dont want to cut all the way around on the top-part. You can use the pull-tab "outline" as a guide.


Youll have to make a cut straight-down the side of the can (on the side where you would drink from)


Step 7) Carefully begin your cut down the side of the can with a razor-blade or utillity knife. Try to make as straight a cut as possible, but dont worry if it's not perfect.


Step 8 ) Carefully begin cutting around the bottom of the can, starting from your last cut down the side, with a pair of sheers or scissors. It's very importiant to leave a little bit of the rounded part of the bottom of the can when your making the cut.


Continue cutting around the bottom; notice how Im leaving a bit of the rounded part. Try not to cut above it completely or it will be much harder to shape the reflector when youre done.


Step 9) When you get about half-way around, start back where you started and go the other way.


Step 10) Meet your last cut to finish cutting-off the bottom of the can.


Bottom removed


Step 11) Carefully sheer-off a very thin amount of the bottom of the can to clean-up the cut and remove any sharp burrs.


This gives you a better idea of what I mean about leaving a bit of the rounded part of the can. This little detail makes it way easier to adjust how wide the reflector spreads-out and maintains its shape. Youll see what I mean later.


Step 12) Continue by cutting the top of the can. Do it as you did the bottom, but remember not to cut all the way around! Leave about 1/2" - 1" on the side where the tab was.


Step 13) Cut to the end of your guide line (if you drew one)


After cutting the top and bottom of the can, you can start to see its final shape


Now that we can get to them, the tabs need to be folded all the way down


Step 14) First, pull out and cut-off the original tab


Step 15) Use needlenose plyers to bend each tab all the way down


Each tab bent flat


Step 16) Use several 3/4"-1" pieces of electrical tape to insulate the opening. Go all the way around the hole. Be careful for sharp edges where you cut.


First piece of electrical tape folded down


Here you may need to use a flat-head screwdriver to tuck the electrical tape in to the lip of the can


Completed taping (inside). Make sure there is no exposed metal around the edge of the hole. This will prevent the reflector from making electrical contact.


Step 17) If you want the best reflection possible, youll want to attach some mylar to the inside of the reflector. Lay a sheet of it at least 5"x9" on the edge of a flat surface and scotch-tape it down on 4 corners to make it as tight and flat as possible. Keep it as close to the edge of your table or workbench as possible.


Step 18 ) Bend-out the sides of your new reflector to open it up and prepare it for the mylar. Now youll see why it is importiant to leave a bit of that rounded edge when you were cutting off the bottom and around the top. If you cut it off by accident, it will still work, you'll just have a harder time making it stay spread-open.


Step 19) Spray a coat of adhesive evenly on the inside of the can; make sure you get the corners and edges.


Step 20) First, MAKE SURE YOUR RAZORBLADE IS WITHIN REACH, now carefully lay the can as flat as possible on the mylar. Make sure the top of the can is as close to the edge of the table as possible. Flush (touching) is best.


Step 21) While youre still holding the can flat on the mylar, use your free hand to cut the mylar along each edge of the can with your razor blade or utillity knife. Lift the reflector off the table and use your thumb to smooth-out any bubbles in the mylar and make sure its adhered completely. Youre done!


Screw your CFL bulb into any standard socket and suspend over your plants. The reflector will rotate freely around the bulb to adjust light direction.

If you'd like a few more detail shots I left out of this post, you can check them out in my gallery here:

https://www.rollitup.org/members/upthedownstair-7216-albums-beer-can-cfl-reflectors.html

Otherwise, I hope this helps some of you shine some more light on your babies and let me know if you need any help.

Peace.

-David
 

UptheDownstair

Well-Known Member
Thanks SkunkyBud, glad I could help! The best part is you get to drink a nice cold beer before you start. Just the thing you need before using those tin-snips! :lol:
 

grow space

Well-Known Member
I use the same concept in my shed -only thing, i dont have any mylar, and i just cut the shape and but my 26 watters in...Works well too i guess....
 

milowerx96

Active Member
Check out the big brain on Upthedownstrs! That is a fine example of hydro from the ghetto. It's way cool + rep. Your choice of beer however.....
 

UptheDownstair

Well-Known Member
Thanks everyone for the comments and the reps.

Mikemirve, I got the socket at homedepot I think. Pretty sure they have them in the electrical section with the light-switch covers and plugs and zipties and shit.
 

Troglart

Well-Known Member
lol socket adapters are sold out whenever i go to home depot or walmart, for the 4 i have i bought out the last 2 which i found lying around not even in the right spot.. both times, i just got a few y-sockets to add a bit more light in. I love your using keystone light lol thats my favorite type of cheap beer, going to try this soon
 

pattystaff89

Active Member
this is a really solid idea. i might have to throw a couple of these on to my setup soon. Do you have any problems with the can getting too hot from the cfl, or any issues pertaining to heat?
 

journey1111

Well-Known Member
that is much neater than balancing a piece of cardboard with mylar taped over it ontop of my lights! +rep
 

UptheDownstair

Well-Known Member
Do you have any problems with the can getting too hot from the cfl, or any issues pertaining to heat?
Nope, no heat issues. Aluminum is great for dissipating heat and doesnt retain it long so it's a great metal to use for this application.

Thanks again for all the positive comments everyone. Im glad this is helping out so many people. Good luck to those of you who are going to try out the idea!

Maybe people could start to post pics of their attempts and show how they're working for their grows! That would be great to see. :mrgreen:
 
Top