Understanding the link between luminous flux and beam angle.
In architectural lighting, luminous flux (lumens) and beam angle are tightly connected. Luminous flux defines the total light emitted by a luminaire. Beam angle determines how that light is distributed in space — and ultimately, how bright the illuminated surface appears.
A narrow beam angle, such as 15°, concentrates light into a smaller area, resulting in high intensity (candela). A wide beam angle, such as 60°, spreads the same amount of light over a much larger area, significantly reducing intensity. To maintain consistent brightness on the target surface when changing the beam angle, it’s essential to adjust the luminous flux accordingly.
Surt: A flexible lighting solution built for precision.
That’s where Surt by Light4U comes in. This professional track spotlight features a manually adjustable beam angle from 15° to 60°, allowing it to shift from focused accent to soft ambient lighting. And with the integrated potentiometer, you can fine-tune the light output manually, directly on site — making it easy to match the beam angle with the desired intensity.
Advanced control options with DALI or Casambi.
Prefer more advanced or centralised control? Surt is also available with DALI or Casambi, offering seamless integration into lighting control systems for even greater precision.
One luminaire. Complete flexibility. Designed for professionals.
With its adjustable optics and control options, Surt delivers practical flexibility without compromising on performance — ideal for professionals who demand accuracy, adaptability and quality in every project. Let’s explore the possibilities together. Contact us at info@light4u.com to find the right setup for your next project.
