You may have to consider other requirements like motion sensor lights, step lights, etc. Generally, you can use 100 lumens to light the path around your house. If you have a big backyard (100 meters), you need 160-200 lumens of light. For basic household outdoor activities, you need 20-150 lumens. Can you notice anything in front of you? Of course, you may need a flashlight. To know how many lumens you need in your living room or backyard, try walking at night. Is 100 lumens bright enough to light up a living room or backyard? With low energy LEDs, you get more light with less power consumption. The problem with incandescent bulbs is that they only use 10% to produce light and the other 90% to generate heat. Incandescent bulbs have higher watts per lumen than LEDs and CFLs. Some energy-efficient LEDs now produce up to 120 lumens per watt. On average, one watt of compact fluorescent gives 67 lumens while an incandescent bulb produces 14 lumens per watt.
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