Aesthetics is a branch of philosophy dealing with the nature of beauty, art, and taste, and with the creation and appreciation of beauty.

Eye strain (Asthenopia) is an ophthalmological condition that manifests itself through nonspecific symptoms such as fatigue, pain in or around the eyes, blurred vision, headache and occasional double vision. Symptoms often occur after reading, computer work, or other close activities that involve tedious visual tasks.

Fluorescent lamp is a gas-discharge lamp that uses electricity to excite mercury vapor. A fluorescent lamp converts electrical power into useful light more efficiently than an incandescent lamp.

General lighting (sometimes referred to as ambient light) fills in between the two and is intended for general illumination of an area.

Light fixture is an electrical device used to create artificial light and/or illumination. A wide variety of special light fixtures are created for use in the automotive industry, aerospace, marine and medicine.

Pub (public house) sometimes referred to as the ‘local’, is an establishment licensed to serve alcoholic drinks for consumption on the premises in countries and regions of British influence.

Prehistoric is a term used to describe the period before recorded history. The term “prehistory” can be used to refer to all time since the beginning of the universe, although it is more often used in referring to the period of time since life appeared on Earth, or even more specifically to the time since human-like beings appeared.

Spectrum is a condition that is not limited to a specific set of values but can vary infinitely within a continuum. The word saw its first scientific use within the field of optics to describe the rainbow of colors in visible light when separated using a prism; it has since been applied by analogy to many fields other than optics.

Task lighting is mainly functional and is usually the most concentrated, for purposes such as reading or inspection of materials.