Illumination control system

Experiment, testing effects of constant light intensity on Arabidopsis growth, utilizes wide-spectrum fluorescent lamps monitored by photocell which controls the power supplied to lamp

Photodegradation of Dyes Using Titanium Dioxide Supported on Glass

Photodegradation of dyes, in aqueous solution was carried out using titanium dioxide coated on glass plates, illuminated by blue fluorescent lamps. TiO₂ coated glass was prepared by sol-gel technique. Air was pumped into the mixture to ensure continuous supply of oxygen in the mixture. Methylene blue removal was studied based on the effect of amount of coated TiO₂ sol-gel, initial concentration, light intensity, light source, and pH of solution medium. Comparison was also made to the powder form of TiO₂ which was prepared by the same method. The highest percentage of methylene blue removal was obtained when the photodegradation experiment was run using 5 pieces of TiO₂/Glass (4 times of sol-gel dip-coating) and 10 ppm of methylene blue solution at 28°C after illumination under 4 white fluorescent lamps of 20 W for 4 hours. About 84% of methylene blue was removed. Methylene blue removal was found to be efficient and comparable to the illumination using near UV light, sunlight, 4 white fluorescent lamps, 4 dark fluorescent lamps and 4 blue fluorescent lamps

A physically based fluorescent lamp model for a SPICE or a simulink environment

This paper describes a method of modeling fluorescent lamps. The lamp model can be implemented in all major circuit simulation software packages, an example has been given for SPICE and Simulink. The model is based upon a simplified set of physical equations that gives the model validity over a wider range of operating conditions than current fluorescent lamp SPICE models allow for. The model can be used to model any low-pressure mercury-buffer gas fluorescent lamps by entering key lamp parameters, length, radius, cold-spot temperature, and buffer gas fill pressure. If fill pressure is not known, a default value dependent on lamp radius is used. The model shows good agreement over a wide range of operating frequencies and lamp powers

The influence of fluorescent lamps with electronic ballast on the low voltage PLC network

The fluorescent lamps or fluorescent tubes are low pressure mercury-vapor gas-discharge lamps that use fluorescence to produce visible light. These lamps inject noise into the power-line communications channel. This can have a detrimental effect on the power-line communication system. In this paper we investigate the effects when the fluorescent lamps with electronic ballasts are seen as noise sources on the powerline channel. It is shown that in the CENELEC band: (3kHz – 150kHz) the interference level from fluorescent lamps is significantly below the allowed maximum PLC signal levels. In the band 150kHz – 30MHz however, PLC signals compete with Electromagnetic Compatibility (EMC) levels. The operational method of the electronic ballast inside the fluorescent lamp is explained

Energy auditing and energy saving measure of the lighting systems in the UiTM engineering tower blocks / Mohd Fared Mohd Aliambran.

The lighting systems consume 12% amount of energy supplied in a commercial building in Malaysia16. In UiTM Shah Alam, most of the fluorescent lamps are always turned on 24 hours per day especially at the corridor site which contribute to significant energy wastage. Some areas also use excessive number of fluorescent lamps which the space becomes too bright and this will also contribute energy wastage. Various electrical energy saving measures are reviewed and proposed to be implemented to reduce energy wastage. There are two proposed methods which may reduce the electrical energy wastage from the lighting system. First is by calculating the optimum number of fluorescent lamps which fulfil the minimum requirement of lighting in the area or building. Second is by using a system that can control the lighting system while maintaining a comfort and safe environment in the building. This paper presents a study on the lighting system which focuses on fluorescent lamps at Science and Technology Mara Towers in UiTM Shah Alam especially along the lecturer's room corridor where the most of power wastage occurs. ECS time-based control system is the proposed system that can control the lighting system in the focused area which is expected to contribute a significant reduction in electrical energy consumption in the building is also presented

Design of LED lamps

In this paper, we study the effect of LED high brightness on the brightness of a luminaire. The nomenclature of diffusers used in the production of "Armstrong" luminaires was considered. The fusion of the diffuser texture and the brightness of a luminaire was studied. The criteria of choosing a luminaire diffuser and LED location in a luminaire were determined. The variant of the lighting system energy efficiency increase with luminaires and linear fluorescent lamps is considered. In the proposed variant, the fluorescent lamps and start regulating devices are replaced with linear LED modules. In order to reduce the glossiness of a luminaire, the LED modules must be covered with opal diffusers, which are used in LED analogues of fluorescent lamps. The presence of a prismatic diffuser provided by the luminaire design and an additional opal diffuser increase the emission area of the LED light, thereby reducing the brightness of the luminescence and, accordingly, the luminosity of the luminaire. Besides, in this case, the curve of a LED lamp light intensity lamp becomes similar to the curve of the light intensity of the same luminaire with fluorescent lamps.Key words: fluorescent lamps, light-emitting diodes, diffusers, the brilliance of a luminaire, light intensity curv