I bought an energy savings lamp. The white wall really looks like daylight, but the bananas look green! I suppose it's impossible to recreate all colour impressions simultaneously without recreating the complete Planck spectrum. My question is: Why don't they allow normal light bulbs (in winter) so that people could turn down their normal heating system a bit?? The electric heating is efficient and saves some normal heating by energy conservation. That seems to be perfect use of energy?! Or have I missed a point?