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"Recommended Illumination Levels Used in Interior Lighting"

Also the chart below taken from a Climate Spectator article by Dr Jenny Riesz is one of the most illuminating. It shows the cross-over point between the cost of wind and a gas combined-cycle power plant depending on gas and carbon prices. While it is slightly out of date with the cross-over between wind and gas now about $1 per GJ lower than indicated, it still provides a good illustration of how gas and the carbon price influence the economics between wind versus gas.

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