### energy | radiation | light:

Chemiluminescence
* can be substantially more sensitive than alk.
* is light
  - given off because of a chemical reaction
  - linear over about a tenfold range
  - luminescence where the energy is supplied by chemical reactions
* is the emission of light as a result of a chemical reaction
  - production of light, resulting from a chemical reaction
* refers to the production of light through a chemical reaction.

City light
* affect all CCD cameras, but less than they affect visual observing and astrophotography.
* block out the night sky, so people forget they're living in space.
* obscure faint meteors just as they obscure faint stars.

Coherent light
* is called laser light
  - produced since there are more excited atoms than unexcited ones
* travels in the same frequency and in the same phase.

Color of light
* Every color of light has a different wavelength
  - is equally good for photosynthesis
+ Light, About light
  * Every color of light has a different wavelength. The shorter the wavelength, the more energy the light has. The speed at which light moves does not depend on its energy. Going through partly clear objects can slow light down by a very small amount.

Coloured light
* has definite, and clearly observable effect on the mood and behaviour of individuals.
* is mixed additively, to use the modern term.

Constant light
* can be stressful to the birds.
* produces severe corneal flattening and hyperopia in chickens.

Continuous light
* can damage plants creating chlorosis, necrotic lesions or faint mottling.
* is the most suitable method for reducing the time to flowering of long-day plants
  - well-tolerated and can be used to accelerate the reproductive cycle

### energy | radiation | light:

Corona
* Many coronas lie in groups or chains.
* Most coronae are part of nimbuses
  - occur in fields
* Some coronae drive solar wind
* are astronomical objects
  - beverages
  - cigars
  - lagers
  - luminous rings of light around the sun or moon
  - often in middle or high latitudes and can be seen all year long
  - part of corollas
  - plasma
  - soccer players
  - structures
* e also influence the time behaviour of the electric field at the ground.
* e are almost twice as dense near chasms as a random set of the same size
  - typically a few hundred kilometres in diameter
  - consist of concentric ridges
  - evolve through several stages
  - form a distinctive class of large volanoes on Venus
* e includes photons
  - sections
* is radiance

Different light
* are also a part of everyday life.
* has different color strengths.

Diffused light
* has little power at all.
* is indirect, appearing to come from every direction
  - located in water

Direct light
* can significantly decrease the quality of the image.
* comes from a point source, such as the sun on a clear day.
* gives off glare, tiring the eyes.
* has an impact on the stored water as well as the room temperature.

Directional light
* allow users to specify lights which are positioned infinitely far away.
* can number up to five and be in different colors and intensities.

Excess light
* can actually burn both flowers and leaves
  - cause natural fur to oxidize or change color
* disrupts circadian rhythm of flora and fauna.

Excessive light
* can cause eyelid lesions
  - quickly destroy the leaf blade
* is as harmful as too little light.

Fill light
* is used to add light in the side of the object nearest the camera.
* represent indirect or reflected light.
* source of illumination that lightens shadows.

Firelight
* are films
* is as old as human history

Flash light
* go on when shaking.
* triggers episodes.

Floodlight
* allow areas to come alive at night.
* are light.