Lumens to Watts Lumens to Watts Converter LED, CFL, halogen or old-school incandescent: pick the light source, enter the lumens you need, and we estimate how many watts the lamp will draw. You can also go backwards (watts → lumens). 1. Lumens → Watts Lumens ≈ common 60W incandescent light Light source LED (high eff.) – 120 lm/W LED (std) – 100 lm/W CFL – 70 lm/W Halogen – 18 lm/W Incandescent – 12 lm/W Custom lm/W… Watts (estimated) watts = lumens ÷ lm/W 2. Watts → Lumens Watts you have e.g. LED 10W bulb Using same light source We reuse the lm/W chosen above. Lumens (estimated) lumens = watts × lm/W Current efficacy: 100 lm/W Real fixtures have drivers, optics and dirt over time, so treat this as a practical estimate. Common lighting equivalents Old incandescent Approx. lumens LED (100 lm/W) Notes 40 W 450 lm 4.5 W Small room, hallway 60 W 800 lm 8 W Most common bulb 75 W 1100 lm 11 W Brighter task light 100 W 1600 lm 16 W Large room Why lumens and watts aren’t the same thing Watt (W) is electrical power. Lumen (lm) is visible light output. Two lamps with the same wattage can produce very different lumen levels depending on their efficiency (lm/W). Formulas watts = lumens ÷ (lumens per watt) lumens = watts × (lumens per watt) Example: 1,200 lm with LED 100 lm/W: watts = 1200 ÷ 100 = 12 W Typical efficacies (rule of thumb) Incandescent: 10–15 lm/W Halogen: 15–20 lm/W CFL: 60–75 lm/W LED household: 80–110 lm/W Good LED panel/strip: 110–130 lm/W FAQ 1. How many watts is 800 lumens? At 100 lm/W (typical LED), 800 ÷ 100 = 8 W. 2. How many lumens is a 10W LED? 10 × 100 = 1,000 lm if it’s a decent LED. Use your real fixture’s lm/W for a better number. 3. Can I use this for outdoor lighting? Yes — pick the LED value closest to your product datasheet, or enter custom lm/W. Related tools Power Unit Converter Pressure Conversions Length Converter Volume & Capacity Mass & Weight Lighting tips Compare bulbs by lumens, not watts. Use manufacturer lm/W if available. Round up for task or outdoor lighting.

Calculators in Lumens to Watts Lumens to Watts Converter LED, CFL, halogen or old-school incandescent: pick the light source, enter the lumens you need, and we estimate how many watts the lamp will draw. You can also go backwards (watts → lumens). 1. Lumens → Watts Lumens ≈ common 60W incandescent light Light source LED (high eff.) – 120 lm/W LED (std) – 100 lm/W CFL – 70 lm/W Halogen – 18 lm/W Incandescent – 12 lm/W Custom lm/W… Watts (estimated) watts = lumens ÷ lm/W 2. Watts → Lumens Watts you have e.g. LED 10W bulb Using same light source We reuse the lm/W chosen above. Lumens (estimated) lumens = watts × lm/W Current efficacy: 100 lm/W Real fixtures have drivers, optics and dirt over time, so treat this as a practical estimate. Common lighting equivalents Old incandescent Approx. lumens LED (100 lm/W) Notes 40 W 450 lm 4.5 W Small room, hallway 60 W 800 lm 8 W Most common bulb 75 W 1100 lm 11 W Brighter task light 100 W 1600 lm 16 W Large room Why lumens and watts aren’t the same thing Watt (W) is electrical power. Lumen (lm) is visible light output. Two lamps with the same wattage can produce very different lumen levels depending on their efficiency (lm/W). Formulas watts = lumens ÷ (lumens per watt) lumens = watts × (lumens per watt) Example: 1,200 lm with LED 100 lm/W: watts = 1200 ÷ 100 = 12 W Typical efficacies (rule of thumb) Incandescent: 10–15 lm/W Halogen: 15–20 lm/W CFL: 60–75 lm/W LED household: 80–110 lm/W Good LED panel/strip: 110–130 lm/W FAQ 1. How many watts is 800 lumens? At 100 lm/W (typical LED), 800 ÷ 100 = 8 W. 2. How many lumens is a 10W LED? 10 × 100 = 1,000 lm if it’s a decent LED. Use your real fixture’s lm/W for a better number. 3. Can I use this for outdoor lighting? Yes — pick the LED value closest to your product datasheet, or enter custom lm/W. Related tools Power Unit Converter Pressure Conversions Length Converter Volume & Capacity Mass & Weight Lighting tips Compare bulbs by lumens, not watts. Use manufacturer lm/W if available. Round up for task or outdoor lighting..