The lamps of yesteryear, incandescents, produce light when electricity heats a thin filament. This causes it to glow. The quality of light is pleasing to many. But the lamps only last about 1,500 hours at best. They’re also inefficient. Roughly 90 percent of the energy is emitted as heat rather than light. Full,  partial, or pending bans on incandescants are now in effect for much of the world, including the European Union. So, for now, expect incandescents to become harder to find.
At present the most widely used alternative to incandescents is the spiral-shaped compact fluorescent lamp, or CFL. It is filled with gas that creates light when electrons from the power source flow into the tube and collide with the gas excitable molecules. CFLs have acquired a bad reputation. There were exaggerated longevity claims, the bulbs don’t dim, they produce an unappealing color, and they contain toxic mercury.
Enter the future. LEDs are digital, they are easier to dispose of, and they last longer. They are following an innovation curve akin to other high-tech items like computers and digital cameras. LEDs are semiconductors, and like all solid-state technology, they tend to get better and cheaper as time passes. Organic LEDs, or OLEDs, have carbon based diodes. These lights could be powered for decades on a single small battery. They could be produced on flexible plastic sheets to hang virtually anywhere. They also don’t require an old fashioned socket. For this reason, developing nations are likely to be the first adopters, with Europe and the US playing catch-up.
Consider the Source

Need a new knocker for the front door? Select a design and push the print button. How about that fork that got damaged in the garbage disposal? Scan one of the remaining ones and print a replacement. Printing 3d objects at home is now possible although the choices of material are somewhat limited.
Soon, very soon, new picture frames, eating utensils, a replacement piano leg for the one the dog chewed up, that weird looking fastener that was missing from the new bookshelf kit, bookends, crown molding, coat hangers, phone chargers, earrings, Toynbee convectors, and flux capacitors will be had by giving a voice command to a StarTrek like replicator.
A new era of Consumer Sovereignty will come to light as additive layer manufacturing technology allows us to bypass those inconvenient economies of scale. Instead of having to purchase a pound of drywall screws, we can just buy one.
Big companies have already bought in to the technology. They envision a future where Home Depot and Kinkos-style shops fill local needs while online markets focus on larger projects and more intense customization. Amazon is planning to install commercial printers in all of its U.S. factories and Staples is rolling out 3D equipment in its European stores.
Thanks, in part, to a variety of open source projects, the Home Depot and Staples models aren’t likely to be as popular as home printing in the long run. Why? Because the mother-may-I product chain is just too bloated and unpleasant. Even today, an item priced at less than four dollars doesn’t justify supermarket shelf space. A service bureau experience marked by overpricing, long lines, outmoded software, outdated hardware, poorly trained staff, and sluggish execution times is seen by most as something to be avoided.
Consider the Source