Since you say "Tiffany Style" as opposed to "Tiffany Antique", I assume that you're talking about lamps with modern wiring and standard sockets. If I'm incorrect and you have a genuine Tiffany lamp, you'll want to take the lamp to a specialist in Tiffany restoration. However, for most modern Tiffany style lamps, the process is quite simple. Take a burnt out bulb, and check the wattage against the recommended wattage on the socket. If the number on the bulb bulb is equal to or lower than that number, you can take the bulb to any hardware store and ask for another just like it, or even an energy efficient florescent! Not only good for the planet, these bulbs are good for your lamps as well, since they burn at a much cooler temperature.
LED lamps
There are a few stores to look such as Light Bulbs, Etc, Inc., Dallas Light Bulb Delivery, Light Bulb Solution, Led Cool Lights, J D International, and Lamps Plus.
Tiffany lamps can be found at a number of different online retailers and merchants. Amazon, Lamps Plus, Wayfair, Home Depot, Overstock, and eBay all offer Tiffany lamps.
Modern table lamps use all sorts of different light bulbs. Most commonly one can find standard 20 watt to 250 watt light bulbs in modern table lamps.
In electric lamps of course!
The next scheduled light replacement for the street lamps in our neighborhood is on October 15th.
Fire in various forms. Candles, oil lamps, gas lamps, etc.
Lamps using LED bulbs are more energy efficient than lamps that use traditional light bulbs. LED bulbs last over 25 times longer than regular light bulbs. Though they may cost more at the outset, the cost of usage of LED lamps is much less over time.
They are known as CFL bulbs. It stands for Compact Fluorescent Lamps.
Those are usually called "lamps" or "light bulbs".
Lamps, projectors and TONS more stuff.
By far the new LED lamps have a longer lifetime than incandescent lamps.