Integrating cylinder radiometry and photometry: Application to radiant flux and irradiance measurements

The main advantages of high-frequency electronic ballasts for high-intensity discharge lamps are high luminous efficacy, small size, lightweight and longer lifetime. This is why high-intensity discharge lamps operating at high frequency are widely used. This paper proposes an approach for designing resonant circuit electronic ballasts controlled by frequency variation for high-intensity discharge lamps. The proposed technique including an AC/DC rectifier, a power factor correction circuit and a DC/AC half bridge inverter. These electronic ballasts offer a wide range of dimming controls and can avoid acoustic resonance. However, under dimming, the electric and photometric characteristics of the lamp change. In order to study these effects under the process of dimming, this work studies the lamp properties by varying both lamp power and operating frequency.

Section: Spectral Measurementsmentioning

confidence: 99%

Behaviour of a high-intensity discharge lamp fed by a high-frequency dimmable electronic ballast

Chammam

Nsibi

Nehdi

et al. 2016

“…As a standard, a 200 W tungsten lamp with high temporal stability, reproducibility, and well-known radiant flux data is used. The spectral radiant flux È HPS () of the HPS lamp is determined by means of the following formula 22 :…”

Section: Spectral Distribution Measurementsmentioning

confidence: 99%

Dimming control by variation of the switching frequency for high-intensity discharge lamps

Nehdi¹,

Elloumi²,

Nsibi³

et al. 2013

In this paper, a high-frequency dimmable electronic power supply for the highpressure sodium lamp is presented. The method includes a full bridge rectifier generating a dc-link voltage and a half bridge inverter to generate a frequency swept lamp power signal to drive the lamp while avoiding acoustic resonance. A dimming technique for a resonant circuit electronic ballast based on a variable frequency is introduced. In addition, the ability in the dimming range is demonstrated by experiments and simulation in order to verify the performance of the proposed circuit. A dimming range from 100% to 50% has been achieved. The efficiency is always higher than 89% and the ballast can accurately follow a fixed dimming plan.

“…It is composed of a photometric cylinder (radius ¼ 0.7 m, length ¼ 1.8 m), a monochromator with input optics and detector, the power supplies, a Hagner digital luxmeter E2X (Spectrograph ORIEL 77400), a charge coupled device (CCD) camera and an automated system controlled by a personal computer. 7…”

Section: Instrumentation For Spectral Measurementsmentioning

confidence: 99%

Behaviour of a high pressure sodium lamp fed by a pulsed power supply

Nsibi¹,

Nehdi²,

Chammam³

et al. 2013

The aim of this paper is to present the colorimetric and photometric results for a pulsed power supply operated high pressure sodium (HPS) lamp. Especially, we are interested in controlling the spectral response radiation of the yellow D line. This sodium D line is composed of two spectral components, one at 589.6 nm and the other at 589.0 nm. The pulsed power supply is a driver for the HPS lamp based on the application of a low frequency (50 Hz) square current waveform through the lamp with one or more pulses on each half cycle. A description is given of the physical modeling of the arc's behaviour. Experimental results obtained from our laboratory power supply for a 400 W HPS lamp supplied at 50 Hz and simulations are shown.