Basics of photometry: Important photometric units of measurement

"Luminous flux (Lumen, lm): Indicates the total amount of visible light emitted by a light source. It shows how “bright” a lamp is overall, regardless of direction or surface area.

Luminous intensity (Candela, cd): Describes how strongly light is emitted in a specific direction. It is crucial for targeted illumination of individual surfaces or objects.

Illuminance (Lux, lx): Shows the amount of light per square meter falling on a surface. This measurement is particularly important for planning workplaces, offices, production halls, or presentation areas.

Practical example: A LED panel with high luminous flux provides a lot of brightness, luminous intensity shows how the light is distributed, and illuminance indicates how intensely a surface is lit."

"Illuminance (Lux) is calculated from the luminous flux (Lumen) and the illuminated area (m²):
Illuminance (lx) = Luminous flux (lm) ÷ Area (m²)
Practical example: If a 2,000 lm LED panel illuminates an area of 10 m², the illuminance is 200 lx. This allows planning in advance how many lights are needed to achieve a standard illuminance (e.g., 500 lx in an office)."

"Luminance (cd/m²) describes the light emitted by a surface in a specific direction. It is important for assessing glare and reflections, e.g., on screens or glossy surfaces.
Practical example: A light fixture can emit a lot of light (high luminous flux), but with narrow emission, luminance at a point can be very high – this must be considered for workplaces or sales areas."

"Luminous efficacy (lm/W) shows how efficiently a lamp converts electricity into light:
Luminous efficacy = Luminous flux (lm) ÷ Electrical power (W)
Practical example: A LED panel with 2,000 lm at 20 W has 100 lm/W. The higher the luminous efficacy, the lower the electricity costs and heat generation. ISOLED products are characterized by high luminous efficacy, saving energy and costs in the long term."

"Incandescent lamps: 10–15 lm/W
Fluorescent tubes: 55 lm/W
Energy-saving lamps: 50 lm/W
LEDs: 100–200 lm/W
Practical example: ISOLED LED solutions allow energy-efficient planning even for large areas, e.g., offices, industrial halls, or retail spaces, thanks to high luminous efficacy."

"Color temperature (Kelvin, K) describes the light color of a fixture:

Warm white (2,700–3,000 K): Cozy, comfortable atmosphere, e.g., for hotels or living spaces.
Neutral white (3,500–4,000 K): Balanced light effect for offices and workplaces.
Daylight white (5,000–6,500 K): Promotes concentration, ideal for labs, workshops, or medical areas.
Practical example: ISOLED offers a wide range of color temperatures that can be combined project-specifically, e.g., with DALI dimming for individual lighting moods."

"CRI indicates how naturally colors are rendered under the light source (scale 0–100).
Practical example: For retail spaces, exhibitions, medical facilities, or laboratories, a CRI ≥ 90 is important to display colors accurately. ISOLED LED solutions offer high CRI values, enhancing visual quality and safety."

"Light distribution shows how light spreads in a room – wide, narrow, or asymmetric.
Practical example: Narrow beam angles are efficient in corridors or hallways, while wide distribution is suitable for sales areas. ISOLED provides photometric datasheets, enabling planners to position lights optimally."

Photometric values allow precise planning: number of fixtures, spacing, orientation, power consumption, and energy efficiency. ISOLED supports with datasheets and light calculations to ensure projects are efficient, compliant, and cost-effective.

Analyze luminous flux, illuminance, color temperature, and CRI. ISOLED provides comprehensive data, including light distribution diagrams, so planners can choose the optimal fixture for offices, industrial halls, schools, or retail spaces.

Yes, differences arise from LED chip type, driver quality, beam angle, and color temperature. ISOLED tests all products in its own laboratories to ensure consistent light quality, high efficiency, and low flicker values.