Select the light bulb that uses the least amount of energy while yet producing an adequate amount of light.

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SSC JE Electrical 10 Oct 2023 Shift 2 Official Paper-I

Answer 1

LED (Light Emitting Diode) uses the least amount of energy while yet producing an adequate amount of light.

Light Emitting Diode bulbs are the most energy-efficient lighting option. LED lights use about 50 percent less electricity than traditional incandescent, fluorescent, and halogen options, resulting in substantial energy cost savings
They produce 40-80 lumens per watt. They can last up to 100000 hours and are up to 90% more energy efficient than incandescent bulbs.
Most fluorescent and incandescent lamps do not provide full brightness the moment they’re switched on, with many requiring three minutes or more to reach maximum light output. LEDs come on at 100% brightness almost instantly, however, and with no re-strike delay.
LEDs can be operated on a low-voltage battery of 12 volts.
Less than 10 percent of the power used by incandescent lamps is converted to visible light; the majority of the power is converted into infrared (IR) or radiated heat. Excessive heat and ultraviolet radiation (UV) present a burn hazard to people and materials. LEDs emit virtually no IR or UV.