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When OliNo measures lamps working on 12 V DC and these lamps are dimmable, then it as a 12 V DC dimmer available to use.

This dimmer is put between the 12 V DC power supply output and the lamp itself.

It appears that this dimmer uses a pulse width modulation (PWM) to switch the voltage to the lamp between a high level and a low level; this at a speed invisible to the human eye. It is a very efficient way to adjust the average level of the voltage that is output to the lamp.

This article gives a number of measurements on the output of the dimmer to show what the dimmer does with the voltage to the lamp.

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OliNo executes endurance tests on (led)lamps. This article explaines what the data that is obtained when doing endurance tests on (led)lamps. An ASSIST publication was used as the basis for the derivation of the results of the measurements.

First the test setup is explained and then the measurements done and extracted.

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When OliNo receives lamps that are dimmable then OliNo has a few dimmers to choose from. Dimmers that are connected between the grid voltage and the lamp have two main principles of operation: phase Wanneer OliNo lampen te meten krijgt die dimbaar zijn, dan heeft OliNo een paar dimmers waaruit ze kan kiezen. De dimmers die rechtstreeks tussen de netspanning en de lamp aangesloten worden kennen een tweetal dim-pincipes: forward phase-cut and reverse phase-cut. Some of it has been explained in an explanation article on this site.

In this article the available dimmers are used for different types of lamps. The current and voltage are measured after the dimmer, so the voltage across the lamp and the current through it.

It will become clear that there are different types of dimmers and lamps react differently. We will look at the voltage and current waveforms to see the differences. The article explains whether the lamp tested was well dimmable with a certain dimmer type or not.

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Dimmers are used in many places, to gerenate the requested atmosphere. And one can believe that dimming also saves on consumed power, which is true, but how much?

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Lamps flicker when they are on. Well, most of them do. And with flickering I mean to say they vary in illuminance. There were messages in the media about (led)lams that flicker so much that people got a headache because of it when working in that light..

OliNo has a way to measure the variations in illuminance and attribute to it a number; a so called illuminance modulation index. This article explains how is measured and gives a number of examples.
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What is white light? In the OliNo lamp measurement articles a chromaticity diagram is given and the color point of the light of the tested lamp is indicated. The chromaticity diagram contains all possible colors, and which are white?
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Since May 2007 OliNo is busy with professional lamp measurements. The goal is to get more transparancy in the lamp market. To reach this goal we publish the lamp measurement results on our public website. This information is accessible for everybody. Until now we have published more than 500 different lamp measurement reports on the website. We have so many measurement report now that old overview was way to long to scroll through. So we needed a beter way to view and search the measurement reports. Time for a new lamp measurements overview.

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Greentubes BV presents a 120 cm long tube light. It is a small fluorescent tube in a transparent plastic outer tube which serves as the housing. At the back side of the inner fluorescent tube a reflector is seated with a white color. At the back side (against the inner back side of the outer tube) a heat sink is positioned. The heat sink is seated inside the transparent plastic outer tube.

This article shows the measurement results. Many parameters are also found in the Eulumdat file.

See this overview for a comparison with other light bulbs.

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