Led Vs Incandescent
Calculator
Results
- Power saved (W)
- 510
- Previous annual energy (kWh)
- 1,095
- New annual energy (kWh)
- 164.25
- Annual energy saved (kWh)
- 930.75
- Annual savings
- 158.2275
Energy results
| Power saved (W) | 510 |
| Previous annual energy (kWh) | 1,095 |
| New annual energy (kWh) | 164.25 |
| Annual energy saved (kWh) | 930.75 |
| Annual savings | 158.2275 |
formula-map diagram
- Power saved (W)
- 510
- Previous annual energy (kWh)
- 1,095
- New annual energy (kWh)
- 164.25
- Annual energy saved (kWh)
- 930.75
- Annual savings
- 158.2275
Energy relationship
Formula
ΔkWh/year = (W_old − W_new) × bulbs × h/day × 365 ÷ 1000= 510
Note
This is a simplified model: it applies the standard equation to the numbers you entered and ignores real-world losses, weather variation, tariff structures and equipment tolerances. Wind power assumes air density 1.225 kg/m³ at ISA sea level and the power coefficient you enter (Betz limit 0.593). Verify with measured data or a professional energy audit before making purchasing decisions.
More in Energy and environment
See all →Frequently asked questions
How much less energy do LEDs actually use for the same brightness?+
LEDs typically use about 75-85% less energy than incandescent bulbs to produce the same amount of light (measured in lumens), so a 60-watt-equivalent LED might draw only 8-10 watts. The comparison should always be based on matching lumen output, not matching wattage.
What's the formula for calculating savings?+
Savings equal the wattage difference between the two bulbs, multiplied by hours of use, multiplied by your electricity rate, giving a cost saved per period. Over the bulb's full lifespan, you also subtract any difference in purchase price to get net savings.
Why do LEDs cost less over time despite a higher purchase price?+
LEDs last dramatically longer, often 15,000-25,000 hours versus 1,000-2,000 hours for incandescent, so you avoid buying many replacement bulbs while also saving on energy, and the combined savings typically outweigh the higher upfront cost within months.
Does bulb wattage always predict brightness?+
No, this is a common misconception: wattage measures energy consumption, not brightness. Lumens measure actual light output, and because LEDs are far more efficient, a low-wattage LED can produce the same or more light than a high-wattage incandescent.
How does heat output factor into total savings?+
Incandescent bulbs waste roughly 90% of their energy as heat rather than light, which can also increase cooling costs in air-conditioned spaces during summer. LEDs run much cooler, so switching can produce a secondary, smaller savings on air conditioning that a basic energy calculation doesn't capture.