How to determine whether the light spots of stage lights are uniform

To determine whether the light spots of stage lights are uniform, the following methods can be used:

First, the observation method

Observe the light spot directly:

Project the stage lights onto a white or light-colored plane and observe the shape and brightness distribution of the light spots.

The ideal spot of light should be circular or oval, with smooth transitions at the edges, and no distinct boundaries between light and dark or bright or dark spots.

Multi-angle observation

Observe the light spot from different angles to ensure consistent uniformity of the light spot in all directions.

Second, measurement method

Measure using an illuminance meter:

Measure the illuminance values at different positions of the light spot (such as the center, edges, four corners, etc.) using an illuminance meter.

Calculate the average illuminance value of the light spot (i.e., the average of the illuminance values of all measurement points) and the maximum illuminance value.

The uniformity of the light spot can be evaluated by the ratio of the average illuminance value to the maximum illuminance value. The closer the ratio is to 1. the more uniform the light spot is.

Use a photometer or photometer:

A photometer or photometer can measure parameters such as the luminous flux and luminous intensity of a light spot, and generate a light intensity distribution curve or illuminance distribution curve.

By analyzing these curves, the uniformity of the light spot can be intuitively understood.

Third, professional testing method

Photometric data photographic test method

This method is tested in accordance with relevant industry standards (such as the cultural industry standard WH/T 26-2007 "Photometric Testing and Labeling of Stage Lighting Fixtures").

By taking photos of the light spot and analyzing them with professional software, detailed parameters such as the uniformity of the light spot, the light spot Angle, and the beam Angle can be obtained.

Fourth, the subjective evaluation method

Visual perception

Experienced lighting technicians or audiences can assess the uniformity of the light spots through visual perception.

A uniform light spot should visually present a smooth and continuous lighting effect, without obvious differences in light and shade or shadows.

Fifth, Precautions

Test environment:

When conducting spot uniformity tests, it is necessary to ensure that the light in the test environment is stable and free from interfering light sources.

The test plane should be made of white or light-colored materials with uniform reflectivity to ensure the accuracy of the measurement results.

Lamp status:

Make sure the stage lights are in normal working condition and adjust them to the appropriate focal length and spot size.

For lamps with adjustable light spot shapes, the uniformity of the light spot under different Settings should be tested.

Take everything into consideration:

The uniformity of the light spot is only one aspect of the performance of stage lights. When making a purchase, other factors such as luminous flux, luminous intensity, color temperature, and color rendering index also need to be comprehensively considered.

By the above methods, it is possible to accurately determine whether the light spots of the stage lights are uniform. In practical applications, appropriate methods can be selected for testing and evaluation based on specific needs and conditions.