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Led lighting design, manufacture and sales

Cephos has been involved in the design and manufacture of LED lighting in the U.K. since 1999, consulting with lighting designers and architects on their external and internal architectural LED lighting requirements. 

Cephos can assist with pcb design for LEDs using Aluminium cored PCB’s which aid the dissipation of heat generated by high output LED’s

Cephos is a major electronic component supply specialist, including the supply of LED’s, enabling the client to take advantage of Cephos buying power to ensure low prices. 

Cephos can assist in the design of all types of printed circuit boards, source connectors, cables and components, through to pcb assembly and testing of completed units.

dictionary definition: The L.E.D. or Light Emitting Diode is an electronic semiconductor device that emits light when an electric current passes through it. L.E.D.s are more efficient than incandescent lamps, and are fast becoming more efficient than fluorescent lamps lending themselves increasingly as general sources of light.

colours: a full range of LED light colour is available from Infra-red, Red through Amber and Yellow to Green and Blue and Ultra-violet. 

device power: from pcb surface mounted sub-miniature units just a couple of millimetres square at around 100mW to large discrete power LEDs at several Watts which require heatsinking.

Select items from our on-line shop, LED floor lighting, LED bollards, designer LED wall lights, LED lighting kits, LED torches, LED accent lighting, LED plinth lighting, book reading lights and LED desk lights.

Latest LED News: 
DURHAM, N.C., MARCH 3, 2008 : Cree Completes Acquisition of LED Lighting Fixtures, Inc. 
This acquisition expands Cree’s market opportunity by providing direct access to the lighting market. Cree's business now encompasses LED chips, components and lighting solutions. It further enables Cree to drive retrofit solutions to convert existing lighting infrastructure to energy-efficient lighting and to accelerate the adoption of LED lighting.  

Editorial reviews of recommended publications / LED Lighting books featured in the on-line shop

Brilliant!: Shuji Nakamura and the Revolution in Lighting Technology By Bob Johnstone

Synopsis
A revolution in the way we use artificial lighting is underway, one that is every bit as sweeping and significant as Edison's invention of the light bulb. The technology of light emitting diodes is ready for widespread implementation. Its impacts will include a reduction in energy consumption for electric lighting by up to 80 per cent. This book tells the story of Shuli Nakamura, a gifted Japanese engineer who came out of nowhere to stun the world with his announcement that he had created the last piece in the puzzle needed for manufacturing solid-state white lights. The invention of this holy grail product which promises to make the ordinary light bulb obsolete, had eluded the best minds at the top electronics firms for 25 years. Until his startling announcement, Nakamura had not even been on the radar screen of most industry observers. The author is the first Western journalist to interview Nakamura and has received the brilliant engineer's full co-operation. He has also interviewed other key players in the imminent lighting revolution proving an exciting preview of the technological, entrepreneurial and artistic creativity that will soon be unleashed by Nakamura's inventions.

Power Supplies for LED Driving By Steve Winder

Synopsis
Light-emitting diodes are being widely used due to their efficient use of power. The applications for power LEDs include traffic lights, street lamps, automotive lighting, architectural lights, household light replacements, signage lighting (replacing neon strip lights and fluorescent tubes), and many more. Powering (driving) these LED's is not always simple. Linear driving is inefficient and generates far too much heat. With a switching supply, the main issues are EMI and efficiency, and of course cost. The problem is to get a design that meets legal requirements and is efficient, while costing the least. This book covers the design trade-offs involved in LED driving applications, from low-power to UB-LEDs and beyond. It provides a practical, "hands-on" approach to power supply design for LED drivers. It includes detailed examples of what works and why, throughout the design process. It provides commentary on how the calculated component value compares with the actual value used, including a description of why the choice was made.

Introduction to SolidState Lighting By Arturas Zukauskas, Michael S. Shur, Remis Gaska

Synopsis
This is a thorough reference that sheds light on the promising field of solid state lighting. Solid state lighting is a rapidly emerging field. Light Emitting Diodes are already used in traffic signals, signage/contour lighting, large area displays, and automotive applications. But its greatest future lies in the possibility of applying solid state lamps to general lighting. Solid state lighting promises to reduce energy consumption as much as fifty percent, cut down on carbon dioxide emission, and even spur the development of a completely new lighting industry. Giving this important emerging field the attention it deserves, "Introduction to Solid State Lighting" comprehensively covers: the history of lighting; the characterization of visible light; conventional light sources; LED basics; extraction of light from high brightness LEDs; and white LED applications of solid state lamps.

Light-Emitting Diodes By E. Fred Schubert

Synopsis
Revised and fully up-dated, the second edition of this graduate textbook offers a comprehensive explanation of the technology and physics of LEDs such as infrared, visible-spectrum, ultraviolet, and white LEDs made from III-V semiconductors. Elementary properties such as electrical and optical characteristics are reviewed, followed by the analysis of advanced device structures. With nine additional chapters, the treatment of LEDs has been vastly expanded, including new material on device packaging, reflectors, UV LEDs, III-V nitride materials, solid-state sources for illumination applications, and junction temperature. Radiative and non-radiative recombination dynamics, methods for improving light extraction, high-efficiency and high-power device designs, white-light emitters with wavelength-converting phosphor materials, optical reflectors, and spontaneous recombination in resonant-cavity structures are discussed in detail. With exercises, solutions, and illustrative examples, this textbook will be of interest to scientists and engineers working on LEDs and graduate students in electrical engineering, applied physics, and materials science.

Distributed Feedback Laser Diodes and Optical Tunable Filters By H. Ghafouri-Shiraz

Synopsis
Advances in optical fibre based communications systems have played a crucial role in the development of the information highway. By offering a single mode oscillation and narrow spectral output, distributed feedback (DFB) semiconductor laser diodes offer excellent optical light sources as well as optical filters for fibre based communications and dense wavelength division multiplexing (DWDM) systems. This comprehensive text focuses on the basic working principles of DFB laser diodes and optical filters and details the development of a new technique for enhanced system performance. It considers the optical waveguiding characteristics and properties of semiconductor materials and the physics of DFB semiconductor lasers; presents a powerful modelling technique based on the transfer matrix method which can be used to improve the design of laser diodes, optical fibres and amplifiers; and, examines the effect of the various corrugation shapes on the coupling coefficients and lasing characteristics of DFB laser diodes. It offers technical advice to improve immunity against the spatial hole burning effect; extensive referencing throughout; and a comprehensive glossary of symbols and abbreviations. It is suitable for both introductory and advanced levels. This is an indispensable textbook for undergraduate and postgraduate students of electrical and electronic engineering and physics as it consolidates their knowledge in this rapidly growing field. As a technical guide for the structural design of DFB laser diodes and optical filters, the book will serve as an invaluable reference for researchers in opto electronics, and semi conductor device physics.

Organic Light-emitting Devices: Synthesis, Properties and Applications By Klaus Mullen

Synopsis
This high-class book reflects a decade of intense research, culminating in excellent successes over the last few years. The contributions from both academia as well as the industry leaders combine the fundamentals and latest research results with application know-how and examples of functioning displays. As a result, all the four important aspects of OLEDs are covered: syntheses of the organic materials; physical theory of electroluminescence and device efficiency; device conception and construction; and, characterization of both materials and devices. The whole is naturally rounded off with a look at what the future holds in store. The editor, Klaus Mullen, is director of the highly prestigious MPI for polymer research in Mainz, Germany, while the authors include Nobel Laureate Alan Heeger, one of the most notable founders of the field, Richard Friend, as well as Ching Tang, Eastman Kodak's number-one OLED researcher, known throughout the entire community for his key publications.

Organic Light-Emitting Materials and Devices (Optical Science and Engineering Series) By Li Zhigang

Synopsis
Examining recent progress as well as future challenges, "Organic Light-Emitting Materials and Devices" covers all aspects of OLEDs, including a systematic investigation of organic light emitting materials, device physics, and engineering. It presents a review of the synthesis, properties, and device performance of electroluminescent materials used in OLEDs and describes manufacturing techniques such as vapor deposition and printing process, microstructural characterization, and performance measurement techniques. It also explores the application of a Si (amorphous silicon) based backplane for organic light emitting display and presents patent statuses of the current investigated organic light emitting materials.

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