### device | lamp | candle:

Beeswax candle
* are a centuries-old tradition
  - extremely expensive and mostly are to be seen in churches
  - simple and inexpensive to make, by all but the very youngest of children
* burn evenly and is sweetly fragrant.

Votive candle
* are often small, short candles in a special glass holder
  - safest for candlelit pumpkins
* can burn much longer than tapers.
* continue to be popular worldwide.

Carbide lamp
* are also nearly indestructible.
* burn off of acetylene gas produced by a constant water drip on calcium carbide.

Different lamp
* emit different combinations of color.
* play a role on light output.

Electric lamp
* Most electric lamps produce light.
* are furniture
  - light fixtures
* produce light by means of electric energy
  - more and better light than the earlier lamps

### device | lamp | electric lamp:

Arc lamp
* Most arc lamps generate heat.
* is an electric lamp
* lose efficiency and are more likely to shatter, if used beyond their rated lifetime.

Electric light
* are on all the time, inside the houses and out on the streets
  - supposedly to guide the gods to the popcorn strings
* work well instead of candles.

### device | lamp | electric lamp:

Incandescent lamp
* Most incandescent lamps have a socket, switch, cord and plug.
* are by nature closer to full spectrum
  - quite sensitive to voltage
  - the primary source of illumination in most homes
* are, however, cheap and easy to work with.
* fail when the filament burns all the way through and breaks.
* have a tungsten filament that is heated by an electric current.
* operate by heating a tungsten filament so hot that it glows.
* waste most of the electrical energy they consume.
* work differently.

### device | lamp | electric lamp:

Light bulb
* Light Bulbs Use lower watt bulbs whenever possible.
* Most light bulbs are made of glass , which means that they can break easily.
* Most light bulbs change electrical energy
  - convert electrical energy
  - draw electricity
  - emit light
  - fit into a socket
  - have filament
* Most light bulbs produce energy
  - thermal energy
* Most light bulbs use electrical energy
* Most light bulbs use less electrical energy
* Some light bulbs emit radiation
  - produce heat
  - receive charge
* Some light bulbs turn electrical energy
  - use batteries
  - work on principles
* are another source of visible light waves
  - electrical components
  - light sources
* are located in basements
  - rooms
  - theatres
  - of the bayonet type
  - tested for both lamp life and strength
* are used for flashs
  - illumination
* burn eternally.
* can get hot so anything touching the light bulb big no no
  - help, but they have to be kept away from the snake to avoid burns
* cause illumination.
* come in all different sizes and power ratings.
  - electricity into light and heat
* give off heat as well as light.
  - the source of electric light
* lose power with use.
* operate in the same way.
* use a relatively low amount of watts
+ Lightbulb, Cautions
  * Most light bulbs fit into a socket. If the socket is turned on, there is electricity there, even if the bulb is out, so there is danger of electric shock. Most bulbs get very hot when they are turned on, and take some time to cool off. Most light bulbs are made of glass, which means that they can break easily. Fluorescent bulbs contain a small amount of mercury, if they break, be careful to not breathe the mercury vapor. With incandescent light bulbs, the filament will eventually break, and the bulb will need to be replaced
  - Types: Light sources :: Machines :: Home appliances
  * Light bulbs convert electricity into light and heat. Except for heat lamps, the heat is considered waste. A light bulb that produces more light and less heat is more efficient