engineering recuitment DRDO Technician A 2022 Mock Test Series (Tier I) Electronic Mechanic Electronic Devices and Circuits LED Lights

निम्नलिखित में से किसमें अधिकतम दक्षता होती है?

1
तापदीप्त लैंप 
2
CFL
3
LED
4
प्रतिदीप्त लैंप 
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