Home
Back
Lumen to Watt Formula:
| From: | To: |
The Lumen to Watt Calculator converts luminous flux (lumens) to electrical power consumption (watts) based on lighting efficacy. This helps determine the appropriate wattage needed to achieve desired brightness levels in a room.
The calculator uses the lumen to watt conversion formula:
Where:
Explanation: The formula calculates the electrical power required to produce a specific amount of light output, considering the efficiency of the lighting technology.
Details: Proper lighting calculation ensures adequate illumination for tasks while optimizing energy consumption. It helps in selecting the right lighting fixtures and bulbs for different room types and purposes.
Tips: Enter total lumens required for the room and the efficacy of your chosen lighting technology. Typical efficacy values: Incandescent (10-17 lm/W), Halogen (16-24 lm/W), CFL (35-60 lm/W), LED (80-120+ lm/W).
Q1: What is lighting efficacy?
A: Lighting efficacy measures how efficiently a light source converts electrical power into visible light, expressed in lumens per watt (lm/W).
Q2: How many lumens do I need for a room?
A: Typical requirements: Living room (1,500-3,000 lm), Kitchen (3,000-4,000 lm), Bedroom (2,000-4,000 lm), Bathroom (4,000-8,000 lm), Office (3,000-6,000 lm).
Q3: Why choose LED lighting?
A: LED lights offer higher efficacy (80-120+ lm/W), longer lifespan, and lower energy consumption compared to traditional lighting technologies.
Q4: Can I use this for all room types?
A: Yes, but consider room size, ceiling height, color scheme, and specific lighting needs (task lighting vs. ambient lighting).
Q5: How accurate is this calculation?
A: The calculation provides theoretical wattage. Actual performance may vary based on fixture design, operating conditions, and light distribution.