LED Technology — MCQ Practice
Interactive MCQ Practice
Test your knowledge. Click “Solve” to reveal options, select your answer, then check the result. 5 questions available.
Two lamps each emit 900 lumens. Lamp P uses 9 watts and lamp Q uses 15 watts. Which pair gives their luminous efficacies in the order P, Q?
If 600 lumens actually fall uniformly on a surface of 2 square metres, what is the average illuminance?
Two white LED lamps have the same correlated colour temperature but use different spectral combinations. Which conclusion is justified?
A procurement team must compare the luminous efficacy of complete LED luminaires. Which measurement pair most directly answers that question?
The 9-watt and 15-watt lamps operate for 5 hours per day on 200 days. How much less electricity does the 9-watt lamp use?