In this Instructable, you will learn where to find common household items that can be used for heatsinking LEDs. When mounting LEDs, you want a surface that is heat conductive and flat. These items will do the job if they are large enough for a given wattage. Reusing materials is better than recycling and it's fun.
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Step 1: Food Storage
Where to find them: Chocolate boxes, cookie boxes, Altoids tin, candy boxes, blue boxes, second hand stores
Where to find them: Canned foods, coffee cans, blue boxes, second hand stores
Where to find them: Glass food and beverage containers (jams, canning jars), blue boxes, second hand stores
Step 2: Hardware
Metal Pipe Ends
Where to find them: Hardware stores (Home Depot, Home Hardware, Canadian Tire, Lowe's), broken pipes
Where to find them: Hardware stores
Metal Pen and Pencil Boxes
LED Aluminum Baseboard
Where to find them: LED dealers, e-bay, failed LEDs
Metal Screws and Bolts
Where to find them: Electronic device, electronic stores, enclosure for your electronic projects
Where to find them: Electronic stores, computer shops, e-bay, LED dealers, used electronic device (eg computers), failed LED lamps
Step 3: Non-metallic Surfaces
If your LEDs are strobed like bike and signal lights or driven under low current, you may use wood and plastic just to hold them in place. The aluminum baseboard that comes with your LED provides the necessary heatsinking.