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 is a 0–100 scale describing how naturally colours appear under artificial light compared with a reference source. CRI 80 is suitable for many general applications, while colour-critical retail, gallery or production tasks may require higher values.

Power factor (PF) is the ratio of real power to apparent power in an AC circuit and ranges from 0 to 1. A value closer to 1 indicates more effective use of electrical energy and a lower reactive burden on the supply.

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 the resistance of an electrical enclosure to external mechanical impact. Under IEC 62262 it ranges from IK00 to IK10; a higher rating corresponds to a higher tested impact energy. Selection should reflect the physical risks of the installation.