Testing
Luminous Intensity
Luminous intensity measures the amount of visible light emitted in a specific direction, typically expressed in candelas (cd). Due to the design of light sources and the control provided by luminaires, the spatial distribution of luminous flux is often non-uniform. Therefore, defining luminous intensity in terms of how luminous flux is spatially distributed allows for more accurate lighting design and performance assessment, ensuring optimal lighting outcomes.
Beam Distribution
Beam distribution refers to how light spreads from the luminaire. A beam distribution chart visually represents how light is emitted from a source, showing intensity (candela) at different angles. Choosing the right beam angle ensures the light suits the design intent and purpose of the space. Whether it’s for task lighting, highlighting artwork or architectural feature, or brightening up a whole room, the right beam distribution makes a big difference.
Colour Consistency
The colour consistency stipulates how close the actual light colour of an LED is to the defined colour location. Standard Deviation of Color Matching (SDCM), also known as the MacAdam Ellipse, is a metric that measures colour consistence. Colour consistency ensures uniform lighting appearance, enhancing visual comfort and aesthetic harmony. An SDCM of 3 or less is considered very good and is important in spaces where consistent, high-quality lighting is key to the overall look and feel.
Colour Quality
The Colour Rendering Index (CRI) is a scale from 0 to 100 that indicates how accurately a light source shows the true colours of objects compared to natural light. A CRI of 80+ is suitable for general areas, while CRI 90+ is ideal for spaces where colour accuracy matters, such as retail, offices, and hospitality. For showcasing products, artwork, or tasks requiring excellent colour rendering, look for CRI of 95 or higher. Choosing the right CRI enhances how colours appear, improving both the look and feel of a space.
Spectral Distribution
Spectral distribution reveals how a light source emits energy across visible wavelengths, directly influencing colour quality and accuracy. It is vital for applications like retail, healthcare, and art galleries where precise colour rendering matters. It also ensures energy efficiency, supports human well-being by aligning with circadian rhythms, and guarantees compliance with industry standards. By analysing spectral distribution, lighting products can be tailored for optimal performance and specific application needs.