Variable impedance LED matrix control system for lamps in PV applications

The interest in LED lighting has been growing recently due to the high efficacy, lifelime and ruggedness that this technology offers. However the key element to guarantee those parameters with these new electronic devices is to keep under control the working temperature of the semiconductor crystal. This paper propases a LED lamp design that fulfils the requ irements of a PV lighting systems, whose main quality criteria is reliability. It uses directly as a power supply a non·stabilized constant voltage source, as batteries. An electronic control architecture is used to regulate the current applied to the LEO matri)( according to their temperature and the voltage output value of the batteries with two pulse modulation signals (PWM) signals. The first one connects and disconnects the LEOs to the power supply and the second one connects and disconnects several emitters to the electric circuit changing its overall impedance. A prototype of the LEO lamp has been implemented and tested at different temperaturas and battery voltages.

LED bulb lamps technical specification and testing procedure for solar home systems.

With the consolidation of the new solid state lighting LEOs devices, te5t1n9 the compliance 01 lamps based on this technology lor Solar Home Systems (SHS) have been analyzed. The definition of the laboratory procedures to be used with final products 15 a necessary step in arder to be able to assure the quality of the lamps prior to be installed [1]. As well as with CFL technology. particular attention has been given to simplicity and technical affordability in arder to facilitate the implementation of the test with basie and simple laboratory too15 even on the same SHS electrification program locations. The block of test procedures has been applied to a set of 14 low-cost lamps. They apply to lamp resistance, reliability and performance under normal, extreme and abnormal operating conditions as a simple but complete quality meter tool 01 any LEO bulb.

Preliminary assessment of the crash-reducing effectiveness of passenger car daytime running lamps (DRLs).

Mode of access: Internet.

Statistical evaluation of the effectiveness of Federal Motor Vehicle Safety Standard 108: Side Marker Lamps (Only). Final report.

National Highway Traffic Safety Administration, Washington, D.C.

The Feast of lamps : a story of India /

Meenakshi and her brother Arumukam so by ox cart with their parents to Madura to see the god Siva, and the goddess Meenakshi for whom the Indian girl is named.

An evaluation of center high mounted stop lamps based on 1987 data.

Mode of access: Internet.

Alternative incandescent traffic signal lamps and systems for improved optical and energy efficiency. Final report.

Federal Highway Administration, Office of Safety and Traffic Operations Research and Development, Washington, D.C.

The effectiveness of center high mounted stop lamps: a preliminary evaluation.

Mode of access: Internet.

Final design and implementation plan for evaluating the effectiveness of FMVSS 108: side marker lamps and high intensity headlamps (only). Tasks #4 and #5 report.

National Highway Traffic Safety Administration, Washington, D.C.

Evaluation of dirt films, lamps and procedures for headlamp washer tests. Final report.

National Highway Traffic Safety Administration, Washington, D.C.

The seven lamps of architecture; also, Lectures on architecture and painting; The study of architecture; Sesame and lilies; Unto this last; The queen of the air; The storm-cloud of the nineteenth century /

Mode of access: Internet.

The seven lamps of architecture.

Added t.-p., engraved.

Old lamps and new and other verse; also By Gaza's gate, a cantata.

Mode of access: Internet.

The seven lamps of architecture.

Mode of access: Internet.