Full spectrum light bulbs are made with the intention of emulating the full light spectrum found in sunlight during midday. These particular lamps come in a wide variety of voltages, wattages, finishes, base types and sizes.
Manner of Operation
The function of full spectrum lights highly depends on the type of bulb used to produce it. There are no technical terms that can fully define full-spectrum lights, which makes it very hard to measure what factor specifically defines the light being produced. Lights which utilize the full spectrum generally fall into two types: fluorescent and incandescent.
Incandescent bulbs that use the full spectrum generally incorporate a glass enclosure made of neodymium. This effectively filters the dominant warm colours that make the usual incandescent light yellow. These bulbs appear to be a mix between purple and lavender when you turn them off.
Full spectrum fluorescent lights; on the other hand, incorporate a mix of various phosphors to reach a wider range of colours in the Kelvin colour temperature scale. The light coming from these types of bulbs appears whiter and bears the closest resemblance to sunlight compared to other fluorescent bulbs. When unlit, these lamps still appear white like most fluorescent lamps. These bulbs are designed to represent the full spectrum colours accurately and typically come with a moderate CRI (colour rendering index).
Full spectrum light bulbs aren't expected to have the exact range of colours and Kelvin temperature that sunlight does, it is only made to specifically emulate the hue and quality of the visible light we see during the day.
Full spectrum bulbs are used for various applications. Generally, these bulbs are used whenever an area needs sunlight or the next closest thing. These lights can be found in greenhouses, plant nurseries and botanical laboratories all over the world.