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Lumen Estimation Calculator

Knowing how many lamps you need to adequately illuminate a room or space can be tricky. In addition to the size of the space, a variety of factors, such as the activities being conducted and wall reflectance can also play a role. Our calculator provides rough estimates for your lighting needs as well as recommendations on the types and quantity of lamps needed to achieve the brightness levels.

What are the dimensions of the space?

Estimate the total square footage of the space, by inputting the length and width of the space. If the space is non-rectangular, estimate the equivalent rectangular dimensions.

Width of room, in linear feet
Length of room, in linear feet
Ceiling height, in linear feet

600 square feet, 8 foot ceilings




What are your brightness needs?

Brightness needs will depend the activity or work being performed in the space, as well as personal preference. Input your brightness needs, in footcandles:

100 fc: Fine manufacturing & industrial

80 fc: Artwork (creation)

60 fc: Bathrooms & Makeup
50 fc: Kitchen prep areas
40 fc: Office Spaces, Classrooms, Retail, Dining Areas
30 fc: Simple manufacturing & industrial
20 fc: Living Rooms, Artwork (illumination), Warehouse / Storage
10 fc: Bedrooms, Residential hallways


20 footcandles




What color are your walls?

The reflectance of your walls will also play a role in the total amount of lighting needed. Spaces with walls of lighter colors will require less light.

Select wall color:

Reflectance: 94%


Your total recommended lumen output requirement is...

12,376 lumens


Your lumen target can be reached with the following...

Product Brightness (each) Quantity Needed Expected Total Lumen Output
 A19 Bulb 800 lm 16 bulbs 12,800 lm
 A19 Filament Bulb 450 lm 28 bulbs 12,600 lm
 BR30 Flood Light 800 lm 16 bulbs 12,800 lm
 T8 LED Tube 1800 lm 7 lamps 12,600 lm
 LED Strip Light 450 lm (per ft) 28 ft 12,600 lm

Your recommended color temperature range is...

3012K
3840K