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The topic of lamps is now a major area for technology, and I continue to do measurements and tests on alternatives. The page discussing CFLs has been pretty popular, and became so large that it's been split into different sections. Because of the latest advances in LED lamps, they are also covered in their own sections in the pages that follow.

It is becoming very clear that the CFL is not only an interim product, but has many flaws that will severely limit its usefulness in the long term. Essentially, CFLs have to compete with LED lamps that have much greater life, are now far more efficient, but don't have as many problems. Recycling is simplified (no mercury), and the ability to operate at very low temperatures with instant full brightness and zero ultra-violet radiation will make LEDs the lamp of choice for many applications where CFLs are simply unsuitable.

The humble incandescent lamp still has its uses though, and hopefully governments the world over will realise that it is impractical (and just plain stupid) to place an arbitrary ban on them just because they are less efficient than other forms of lighting. In quite a few applications, there are exactly zero alternatives to incandescent lamps, and the sooner this is recognised the better. It's notable that many of the deadlines set have been and gone, yet there is still a good supply of incandescent lamps in most parts of the world.

In addition, there are minimum energy performance standards being imposed that are of sometimes dubious benefit, and in Australia it was even proposed (by bureaucrats) that some changes required that the laws of physics be rewritten to accommodate their goals. This is not helpful.

Lamps and LightingUpdate
> Incandescent LampsThe worldwide 'incandescent lamp ban' debate - get some facts before you act! Jan 13
> Compact Fluorescent LampsCFLs may not be to everyone's liking, but if used properly they are still a good option Jan 13
> Fluorescent LampsTraditional fluorescent tube lamps and their alternatives. Jan 12
> Fluorescent Lamps - Part 2How Fluorescent Lamps Work Jul 07
> LED LightingA look at some of the latest applications for LED lighting products.   Sep 08
> LED Lighting - Thermal ManagementExamination of this most critical area of LED lighting.   Sep 13
> ESL LightingElectron Stimulated Luminescence Lamps - an overview   Mar 12
> Sulphur Plasma LampsA look at sulphur plasma lamps - the next big thing or continued failure? Apr 10
> Dimmers (Part I)Dimmer technology, past, present and future. Dec 13
> Dimmers (Part II)The focus is on 3-wire dimmers, why they are better and why 2-wire dimmers should be phased out now.   May 15
> Dimmers & LEDsDimming LEDs continues to cause grief. Find out why. (See Dimmers Part II for more information) 0-10V Dimming Mar 17
> Induction LampsInduction lighting becomes mainstream. A look at the technology used. Dec 11
> Lumens, Lux & CandelasAn overview of the three ways that describe how much light is provided by a given light source. Dec 13
> Solid State Lighting & TemperatureLED and CFL light sources are temperature sensitive because of the electronic power supplies. High and low temperatures can cause problems. Jan 14
Power Supplies & Power MeasurementsUpdate
> Electronic TransformersHow they work (in detail) and a warning to watch out for some that are very dangerous Jun 10
> External PSUsHot on the heels of the CFL fiasco, now the legislators have banned external transformer supplies May 14
InrushInrush CurrentWhat it is, what it can do, and how to prevent it from causing problemsOct 10
Power FactorPower Factor - RealityA simplified explanation of power factor (PF) so that the basic concepts are understood before delving deeper. Dec 12
PFCPower Factor CorrectionAn explanation of how active power factor correction (PFC) circuits work Jan 12
Power CalculationsPower CalculationsHow to determine power, VA, RMS voltage and current - Analogue or digital   Jan 17
ReactanceReactanceA close look at the effects of capacitance, inductance and non-linear loads on the power grid Feb 12
Alternative EnergyUpdate
> Power Saver ScamThe fraudsters are still at it - 'power savers' may not be in the news, but they refuse to go away. Jan 12
> Power Saver TestsSo, I ran tests on one of the fraudsters so-called 'products'. No surprises, it doesn't work!   Sep 13
> Wind Turbine IntroductionAn introductory look at the economics and social problems of wind turbines 28 Apr 10
> Wind Turbine NoiseWind turbines may not be the gentle giants they seem. The introduction to NZ research. 28 Apr 10
> Main IndexReturn to main index page
> Articles IndexArticles index page
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Lumens, Watts & Lux This book is just what's needed for those who are interested in knowing more about lighting in general and the often complex relationship between Lumens, Watts and Lux. Karen Wardell has done a vast amount of research, and this book is the end result. A quote from the back cover ...
There are two sides to lighting design - a hard side and a soft side.

The hard side refers to the attributes and physical aspects of the design process (the things you cannot change), whereas the soft side (the human side) deals with things you can - such as the quantity of light, its quality and location.

This publication is more concerned with the latter, though a general understanding of lighting practice will benefit in the decision-making process. It also helps to remind us which element we are dealing with regarding the two.
Karen's book is available in some libraries, but unfortunately her website no longer exists.

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