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Current LEDs from Philips (also Osram) compared to the old Philips energy-saving lamp and other no-name bulbs. How have incandescent lamps gradually developed? How much has power consumption fallen? When is it worth buying an LED lamp? Do LEDs or energy-saving lamps still get hot? From the simple light bulb to the halogen lamp to the energy-saving lamp and finally to the LED lamp. In addition to the power measurement, there are also insights into how the individual models work, and into the problems and disadvantages.