Background THD and IEC-61000-3-2:2006 results in lamp measurement articles
Posted by Marcel van der Steen in Explanation 2 Comments»
This article gives the background and explanation of the THD and compliancy to IEC-61000-3-2:2006 measurement details and results given in the lamp measurement articles.
From lamp measurement articles links will be used to refer to this explanatory article, and herewith keeping the measurement articles small in length and to-the-point, by preventing the same explanation over and over.
This article explains about the S/P ratio. At very low ambient light levels this ratio indicates the maximum gain in efficiency one can obtain just by using different receptors in the human eye.
The teaser image shows the spectrum of the light of a streetlight, and also the two human eye sensitivity curves; the daytime (red) curve lower in sensitivity than the nighttime (black).
Illumination, expressed in lux, is being measured frequently. There are a number of norms that give recommended values for lux at dif ferent workspots, roads etc. Final customers seeking installers for lighting, can require these norms to be met. Measurements are normally done with luxmeters, but not all give the correct readings.
This article explains the measurement technique of two meters that both measure lux and therefore could be used to verify a lighting installation. However both do it on its own way and depending on the spectrum of the light of the lighting installation, each type of lux meters give significant different results.
The cause for this is also explained and the article concluded with recommendations.
Current trends in energy supply and use are patently unsustainable – economically, environmentally and socially. Without decisive action, energy-related emissions of CO2 will more than double by 2050 and increased oil demand will heighten concerns over the security of supplies. We can and must change our current path, but this will take an energy revolution and low-carbon energy technologies will have a crucial role to play.
Wind energy is perhaps the most advanced of the “new” renewable energy technologies, but there is still much work to be done. This roadmap identifies the key tasks that must be undertaken in order to achieve a vision of over 2 000 GW of wind energy capacity by 2050.
A close look at the Color Rendering Index (CRI, or Ra)
Posted by Marcel van der Steen in Explanation 8 Comments»
This article looks in detail at the CRI. What is meant with it, is it a good measure, what does it mean in practical terms and how is the relation with LEDs that are penetrating the market more and more?
These are a number of questions that will be dealt with, in this article, in a very practical way.
The Economics of Nuclear Reactors: Renaissance or Relapse?
Posted by Mark Cooper in Unsustainable 1 Comment»
Within the past year, estimates of the cost of nuclear power from a new generation of reactors have ranged from a low of 8.4 cents per kilowatt hour (kWh) to a high of 30 cents. This paper tackles the debate over the cost of building new nuclear reactors. The most recent cost projections for new nuclear reactors are, on average, over four times as high as the initial “nuclear renaissance” projections. The additional cost of building 100 new nuclear reactors, instead of pursuing a least cost efficiency-renewable strategy, would be in the range of $1.9-$4.4 trillion over the life the reactors.
The REVA NXR (NeXt Reva) is a new lithium-ion powered electric car from REVA Electric Car Company, which is scheduled to go into production early 2010. The REVA NXR and REVA NXG were launched at Frankfurt International Motor Show on 16th September 2009. The REVA NXG (NeXt Generation), REVA’s showcar, is the company’s 2011 model. REVA NXR is an M1 category three-door, four-seater hatchback family car that is suitable for urban driving. Top speed is 104 kph (65 mph) with a range of 160 kms (100 miles) per charge. If using the 90 minute fast charge (normal charging is eight hours), the REVA NXR offers an effective range of 320km a day. A fast charge for 15 minutes will provide a 40 km (25 mile) range.
Background measurement data lamp measurement articles
Posted by Marcel van der Steen in Explanation No Comments»This article gives the background and explanation of many measurement details and results given in the lamp measurement articles.
From lamp measurement articles links will be used to refer to this explanatory article, and herewith keeping the measurement articles small in length and to-the-point, by preventing the same explanation over and over.
Sinautec’s forty-one seat Ultracap Buses have been serving the Greater Shanghai area since 2006. The bus is powered entirely by electricity, which is stored in ultracapacitors and batteries onboard. When the bus stops at passenger stops, the overhead charger quickly recharges the ultracapacitor onboard to allow the bus to go to its next destination. The vehicle is noise free and generates no tailpipe pollution.
With small size, a tiny price, zero pollution, fun and futuristic design, AIRPod mark a turning point in the range of urban vehicles while renewing the idea of the automobile and transportation. You can drive with a joystick, it only costs one euro per 200 km. The AIRPod runs on compressed air.
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