Quiz #3: Same light — which bulb uses the least power?

QUIZ 💡 Same light (about 800 lumens). Which bulb uses the LEAST power?

A) Old bulb B) CFL C) LED D) All the same

⏱️ You have 3 seconds… comment your answer before you read on! 👇

✅ Answer: C — the LED!
For the same light: old bulb ≈ 60 W · CFL ≈ 14 W · LED ≈ 9 W.

🔥 Why? An old bulb turns about 90 % of its power into heat, not light.
💡 Light per watt: old ≈ 13 lm/W · CFL ≈ 57 lm/W · LED ≈ 89 lm/W.
📊 3 hours a day for a year: about 66 kWh (old bulb) vs about 10 kWh (LED).

Same light, way less power.