The mounting of the listed components in the 3D printed base ensures a constant center-to-center distance between the pulleys (100.5 mm) and a low pre-tension force required for the use of a toothed belt. The pulleys are identical, with equal diameters, modules, and the number of teeth. It transmits the angle of rotation to the driven pulley using a toothed belt. A driving pulley with internal toothing is attached to the gear. The stepper motor has a 16-tooth gear attached to the end of the shaft. We used the NEMA 23 stepper motor, which rotates the 3D-printed sliding table, the light bulb holder, the light bulb socket, and the light bulb.
( a) Components of the rotary sliding table ( b) Assembled rotary sliding table.ĭuring the measurements, the rotary sliding table with the light bulb holder is rotated precisely by a stepper motor.
Led light table measuring capability software#
The measuring system is controlled using the MATLAB software environment, which is also used to plot the results: The distance between the sensor and the light source (900 mm) is also determined by the length of the standard-size tubes and the space between the center of the light bulb and the first aperture of the tunnel, which provides enough space to rotate the rotary sliding table with the light bulb holder. Therefore, we have defined a distance of 900 mm between the sensors and the light source, which ensures acceptable measurement uncertainty due to a solid angle greater than 0 sr. On a photometric bench (measuring system), we determined the minimum distance between the sensor and the light source, so that the solid angle of the light source towards the sensor is within the required limits. In this research, we only tested light sources with a maximum bulb diameter of 65 mm.
Led light table measuring capability portable#
We designed and assembled a portable measuring system that enables us to perform multiple measurements for determining the quality of LED substitutes for conventional light bulbs. Īs a part of the project, we reviewed the scientific and technical literature about the negative effects of fluctuating light on humans. Fluctuating lighting has a negative impact on healthy people, and an especially strong impact on people with neurological disorders such as photosensitive epilepsy, as well as on individuals with autism. The consequences of exposure to a fluctuating luminous flux have been observed, for example, in night-shift workers, who have reported more frequent headaches, fatigue, and concentration difficulties. The fluctuating luminous flux emitted from LED bulbs is caused by the fluctuating electric current through the light bulb. There are some lower-quality ones that have a high percentage of fluctuation in the luminous flux, which can have a negative impact on people’s well-being and health. There are different LED bulbs of different qualities on the market, which, of course, also has an impact on the quality of the emitted luminous flux. Most artificial light sources intended for general lighting emit a fluctuating luminous flux, including LED light bulbs. In recent decades, the use of artificial light sources has increased exponentially, and, consequently, so has the amount of time people are exposed to artificial light. Hot bodies, including the Sun, are the source of an almost constant luminous flux. The evolution of humans and animals has occurred by exposure to light from the Sun. In parallel to the many advantages of LED bulbs, research also shows their disadvantages. LED light bulbs consume less electricity, have a longer lifetime, and are made of less environmentally harmful materials compared to energy-saving light bulbs. Consumers are choosing modern LED bulbs because of EU Directives and their many advantages compared to energy-saving light bulbs. They have almost completely replaced incandescent, energy-saving, and halogen lamps.
The number of light-emitting diode (LED) light bulbs on the market is increasing nowadays.
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