They are based on the value of a product or service.

They depend on measurable information.

They rely equally on personalized information and averages.

They focus on the costs to the customer.

it favors companies with low production costs.

it encourages sellers to set prices lower than their costs will allow.

it provides benefits for companies that buy materials in bulk.

it promotes the use of a single pricing strategy.

not so expensive

available in various colors

twice as efficient as incandescent lights

easier to install

red, orange, and green LEDs.

engineers

white-light-emitting diodes

digital clocks, calculators, toys, and similar devices

show the problems and dangers associated with this form of lighting

give an example of a type of lighting that is not as important as it once was

explain why people in developing countries prefer kerosene to electrical light

demonstrate that kerosene is brighter and easier to use than WLEDs

uses a different amount of energy

produces less heat

is made from different materials

uses a red plastic filter, not a green one

powerful

experimental

inexpensive

standard

water power

the energy of the sun

a human-powered generator

batteries

Their tendency to flicker

The need to replace them often

An annoying sound

The harsh quality of the light they produce

green LED

blue LED

white LED

red LED