Instrument for testing LED lamps Lamptest-2

Over the holidays, I made a simple device for a well-known company that allows you to control most of the parameters of LED lamps.

The purpose of the Lamptest-2 device is the incoming inspection of Chinese lamps in the warehouse. It allows you to quickly identify deviations in lamp parameters, and unqualified personnel can use the device after minimal training.

Lamptest-2 allows you to control eight parameters:

  • power consumption;
  • power factor;
  • ripple of light;
  • light flow;
  • work with a switch with an indicator;
  • decrease in brightness at reduced voltage;
  • undervoltage ripple;
  • driver type.

The left screen displays the ripple ratio and luminous flux. Since instead of a large integrating sphere, a small cube is used and a simple sensor is used, the measurement of the luminous flux is approximate: it is measured with an error of no more than 3% for pear lamps with warm light, for lamps with neutral light, the displayed value is approximately 6% higher real. For lamps with directional light, correction factors will be required.

The right screen displays the lamp supply voltage, power consumption, current consumption, power factor.

A special plug-in holder is installed in the device (it is faster to insert and remove the lamp than to screw and unscrew). A set of adapters (E14 is also plug-in) allows you to check lamps of any type (not all adapters are shown in the photo).

The device comes with a laboratory autotransformer (LATR) for accurately setting the 230V voltage to measure power and luminous flux, as well as to check the lamp operation at low voltage (you can determine the type of driver and control the ripple at low voltage).

In this case, the task was not to control the color temperature and color rendering index of the lamps, but if necessary, you can add such features.

The cube is made of plywood and painted with matt white on the inside and black on the outside. The light sensor is located behind the shutter so that only the reflected light falls on it, in addition, it is covered with paper for additional brightness equalization.

A ready-made Chinese module is used to measure voltage, power and power factor. Ripple and luminous flux are measured with a homemade device based on a D1 mini microcontroller and an iArduino light sensor (

https://ammo1.livejournal.com/1294350.html

). A switch with an indicator on a neon lamp is installed on top of the electronics housing. Just in case, a fuse is installed at the entrance.

Despite the artisanal appearance, the device allows you to quickly and easily identify deviations in a batch of lamps.

As far as I know, there are no analogues of this device, so I suspect that all other Russian lamp manufacturing companies either do not carry out incoming control of lamp lots in warehouses at all or donate lamps to the laboratory, which is long and very expensive.

The cost of components for assembling the Lamptest-2 device does not exceed 8000 rubles, and the most expensive in it is the LATR (3120 rubles) and the case (about 2000 rubles).

The Lamptest-2 device still exists in a single copy. If someone else needs such devices, you can do it.

© 2022, Alexey Nadyozhin

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