WEBVTT

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We will compare the efficiency and the autonomy obtained with different lamps fed by a battery of accumulator

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We will compare the classic lamp 21 W 12 V incandescent and a model 12 V LED

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To compare the yields, a luxmeter measuring the lighting power and a power meter for consumption

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Conventional lamp: 440 * 100 = 44,000 Lux for 25 Watts consumed

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The filament bulb was very hot!

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We lost a little: 380 * 100 = 38 000 Lux, or about 15 to 20% less light efficiency ...

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On the other hand the power consumed is only 3.5 Watts! Against 25 W just now

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The LED is 8 times more economical for 20% loss in luminous efficiency

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Either a longer 6.5 battery life with the LED! Example 3 h for 7 Ah in filament, 20 h in LED!