LED Energy Saving vs Incandescent Predictor

LEDs use 75-85% less energy than incandescent bulbs for the same light output (lumens). A 10W LED produces as much light as a 60W incandescent — saving 50W per bulb. For a home with 40 bulbs running 3 hours/day: Incandescent = 40 × 60W × 3h × 365 = 2,628 kWh/year = $315/year. LED = 40 × 10W × 3h × 365 = 438 kWh/year = $53/year. Annual savings: $262. Over the 15,000-hour LED life (vs 1,000-hour incandescent), you replace the incandescent 15 times. Energy savings over LED lifespan per bulb: (60W - 10W) × 15,000h / 1,000 × $0.12 = $90 per bulb. For the home: $90 × 40 = $3,600 in energy savings + $150 saved in replacement bulb costs.

Lumens measure light output (brightness), watts measure power consumption. Incandescent efficacy: 12-18 lumens/watt. LED efficacy: 80-150 lumens/watt. Conversion guide: 40W incandescent = 450 lumens = 4-5W LED. 60W incandescent = 800 lumens = 8-10W LED. 75W incandescent = 1,100 lumens = 11-14W LED. 100W incandescent = 1,600 lumens = 15-18W LED. 150W incandescent = 2,600 lumens = 25-30W LED. Color temperature: Warm White (2700K) matches incandescent glow. Daylight (5000K) is brighter/cooler. Always choose by lumens, not watts. A 10W LED at 800 lumens = 80 lm/W efficacy vs 13 lm/W for incandescent — over 6× more efficient.

Yes, quality LEDs have a rated life of 15,000-50,000 hours compared to 750-2,000 hours for incandescent. A 25,000-hour LED running 3 hours/day lasts 22.8 years. An incandescent at 1,000 hours lasts 11 months. However, lifespan depends on: (1) Heat management — LEDs in enclosed fixtures run hotter, reducing life by 20-40%. (2) Driver quality — cheap LEDs fail from capacitor/electronics failure before the LED chip degrades. (3) Dimmer compatibility — non-dimmable LEDs on dimmers can flicker and fail early. (4) Voltage fluctuations — consistent 120V is ideal. L70 rating: time until LED output drops to 70% of initial. Good LED: L70 > 25,000 hours. Excellent: L70 > 50,000 hours. Buy UL/ETL listed brands with 5+ year warranties.

If every US home replaced just one 60W incandescent with a 10W LED, it would save: 6.5 billion kWh/year — enough to power 600,000 homes and eliminate 4.6 million tons of CO₂ (equivalent to taking 1 million cars off the road). For a single home switching all 40 bulbs: energy savings of 2,190 kWh/year eliminates 1.86 tons of CO₂ (equivalent to planting 40 trees/year). LED manufacturing has higher upfront carbon cost (~2 kg CO₂ per bulb vs 0.5 kg for incandescent) but the energy savings offset this in 2-3 months of use. Over a 25,000-hour life, an LED has 80% lower lifecycle carbon footprint than incandescent. LEDs also contain no mercury (unlike CFLs) and are fully recyclable.