Let’s make lighting clear.

Watt (W) describes the electrical power a luminaire consumes while operating. It is not a measure of brightness by itself. Compare lumen output for light quantity and lm/W for energy efficiency.

Lumen (lm) measures the total visible light emitted by a source. A higher lumen value means more total light, while the optical system and beam angle determine how that light reaches the application area.

Luminous efficacy shows how many lumens a luminaire produces per watt of electrical power and is stated in lm/W. It is an important efficiency metric, but optics, driver quality, thermal management, operating temperature and service life must also be considered.

Kelvin describes how warm or cool white light appears. Around 2700–3000 K is warm, 4000 K is balanced neutral white and 6500 K has a cooler appearance. The correct value depends on the task, environment and visual-comfort requirements.

An IP rating uses two digits to describe protection against solid objects and water. The first digit covers solids and dust; the second covers water ingress. The required rating depends on the installation, cleaning method and environmental exposure.

A lens is a secondary optical element that collects LED light and directs it towards the target surface at controlled angles. Symmetric and asymmetric distributions serve different applications, improving uniformity and reducing dark areas and wasted light.

CRI assesses how faithfully a light source renders colours compared with a reference source. It is not a measure of brightness or energy efficiency. Where colour discrimination matters, consider the application’s colour requirements as well as the general CRI value.

Power factor (PF) is the ratio of real power to apparent power. At the same real power and supply voltage, a higher PF means lower RMS input current. PF depends on phase displacement and current harmonics; it is not the same as driver efficiency or luminaire efficacy in lm/W.

The CE mark indicates the manufacturer’s declaration that a product meets the applicable health, safety and environmental requirements for the European Economic Area. It is not a quality grade; it represents responsibility for conformity with relevant legislation.

ENEC is a voluntary third-party certification mark demonstrating compliance with relevant European safety standards for electrical products. The scheme may include accredited testing, production surveillance and regular factory inspections, complementing the CE conformity process.

An IK rating describes an electrical enclosure’s protection against external mechanical impact under IEC 62262 test conditions. It does not describe water or dust protection, which is covered by the IP rating. Consider the model’s verified IK rating together with impact risks at the installation site.