Colour Rendering Index: Light bulbs offer a varying range of attributes that can produce different light outputs and qualities. The colour rendering index (CRI) provides a base of measurability to render colour accurately and consistently.
Colour Temperature: Colour characteristics of light (temperatures) measure the appearance of the light from warm (yellows/red) to cool (white). Colour temperature is rated in degrees of Kelvin and do not reflect the physical temperature (or heat) of a lamp. Incandescent bulbs (2700 degrees Kelvin) and halogen lamps (3000 degrees Kelvin) are at each end of the colour spectrum.
IP Rating: (or International Protection Rating) consists of the letters IP followed by two digits and an optional letter. As defined in international standard IEC 60529, it classifies the degrees of protection provided against the intrusion of solid objects (including body parts like hands and fingers), dust, accidental contact, and water in electrical enclosures. The standard aims to provide users more detailed information than vague marketing terms such as waterproof.
The first digit indicates the level of protection that the enclosure provides against access to hazardous parts (e.g., electrical conductors, moving parts) and the ingress of solid foreign objects.
The second digit indicates the level of protection of the equipment inside the enclosure against harmful ingress of water.
Lumens: The amount of light a bulb produces.
Wattage: The amount of electricity consumed by a bulb.