Lighting basics · Dcube Swiss
Lighting theories
The concepts that recur in each lighting project, explained simply: units of measurement, color temperature, color rendering, glare, beam angle and protection indices.
Understanding light
Illumination
How many lux, for what use?
How the illumination is calculated
Luminous flux
Flow from a source
Where does the lumen come from?
The colour - or hue of the light
Color Temperature Guide
Kelvin, Celsius and correlated temperature
The HD "high definition" of light
What the Ra Index Reveals
How the CRI is calculated
Measuring visual comfort
Glare guide
The CIE standard formula
Powering light
Projection angle
Beam angle and field angle
Spectral markers
Visible light, in wavelengths
The energy of a photon
Risk Group Benchmarks
Rank the photobiological risk
Maximum exposure time
Efficacy benchmarks
Watt does not measure light
Light efficiency, lm per watt
Voltage marks
Low voltage or mains?
The Ohm's Law
Current marks
The current that powers the led
Deduct Driver Current
The dust and water protection index
Choosing the right protection index
The normative grid
A 24-hour biological clock
How light blocks sleep
Each species, its clock
HCL Human Centric Lighting
Human Centric Lighting (HCL) is a light design theory and approach that aims to align artificial lighting with the natural biological (circadian) rhythms of the human being to improve health, well-being and productivity.
Basics Principles Visual and non-visual effects: The theory takes into account not only the vision of shapes and colors, but also the biological impact of light on the secretion of melatonin (sleep hormone) and the level of cortisol (vigilance). Dynamic variation The light changes in intensity and color temperature over the hours to mimic the course of the sun. Tunable White Technology Use of luminaires capable of changing from a warm white to a cool white in an automated way. HCL Design Pillars Dynamic Illumination Levels: Light power modulation according to the time of day. Adaptive color temperature Cold and bright light in the morning to boost energy, warm and soft light in the evening to prepare for rest. Spatial distribution Light distribution that respects the visual field and enhances overall visual comfort.
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