Lighting Calculator

Select Average Illuminance:

Room Length:

Room Width:

Light Bulb Output (lm/bulb):

Room Area (m²): Room Area (ft²): Total Lumens Required:

1. What is a Lighting Calculator?

Definition: This calculator determines the total lumens required to light a room based on its dimensions and desired illuminance level (lux), and optionally calculates the number of bulbs needed based on bulb output.

Purpose: It helps in planning lighting for homes, offices, or workshops by ensuring adequate illumination for different activities or room types.

2. How Does the Calculator Work?

Lighting requirements are calculated using:

\[ \text{Lumens} = \text{Lux} \times \text{Area (m}^2\text{)} \] \[ \text{Bulbs} = \lceil \frac{\text{Lumens}}{\text{Lumens per Bulb}} \rceil \]

Steps:

Convert room dimensions to meters
Calculate area: Length (m) × Width (m)
Calculate lumens: Lux × Area (m²)
If bulb output is provided, calculate number of bulbs (rounded up)

3. Importance of Lighting Calculation

Details: Proper lighting enhances comfort, productivity, and safety. This calculator helps match illumination levels to room use (e.g., bright for workshops, dim for TV viewing) and ensures energy-efficient bulb selection.

4. Using the Calculator

Tips: Select the room type/illuminance level, enter room dimensions with units, and optionally provide bulb output in lumens. Results show area and lumens required, plus bulbs needed if bulb data is entered.

Examples:

Kitchen (300 lux), 3m × 4m, 60 lm/bulb:
- Area = 12 m²
- Lumens = 300 × 12 = 3600 lm
- Bulbs = ceil(3600 / 60) = 60 bulbs
Bedroom (100 lux), 10ft × 12ft:
- Area = 3.048m × 3.6576m = 11.15 m²
- Lumens = 100 × 11.15 = 1115 lm

5. Frequently Asked Questions (FAQ)

Q: What is lux?
A: Lux is a unit of illuminance, measuring lumens per square meter (lm/m²).

Q: What are lumens?
A: Lumens measure total light output from a source.

Q: Why round up bulb count?
A: To ensure sufficient lighting, as partial bulbs aren't practical.

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