Candlepower to Lumens Calculator

Convert luminous intensity to total light output using beam angle.

Lighting Calculator:

Convert candlepower (candela) to lumens using beam angle for accurate lighting calculations. Perfect for lighting design, photography, and electrical engineering applications.

Lighting Intensity Converter

Choose conversion direction

Luminous intensity in candela

Light spread angle in degrees

Quick selection for common lighting patterns

Lighting Conversion Results

Enter candlepower and beam angle, then click "Calculate"

to see lighting conversion results

Candlepower to Lumens Conversion

In lighting technology, candlepower (measured in candela) and lumens represent different aspects of light. Candlepower describes how intense a light source is in a specific direction, while lumens measure the total amount of visible light produced. Converting between these units requires understanding the beam angle, which determines how the light spreads.

This calculator bridges the gap between directional light intensity and total light output, essential for lighting designers, photographers, and electrical engineers who need to understand how focused beams translate into usable illumination for spaces or subjects.

The Lighting Conversion Formulas

The conversion uses solid angle geometry to relate intensity to total output:

Candlepower to Lumens
Lumens = Candela × Solid Angle (steradians)
*Solid Angle = 2π × (1 − cos(θ ÷ 2)) where θ is beam angle in degrees
Lumens to Candlepower
Candela = Lumens ÷ Solid Angle (steradians)
*Divide by solid angle to find directional intensity

Common Lighting Conversions

Here are conversion examples for different lighting scenarios:

Light Type Candlepower (cd) Beam Angle (°) Lumens (lm) Application
Spotlight 1,000 15 201 Stage lighting
Flashlight 500 30 251 Portable lighting
Flood Light 800 60 1,005 Outdoor illumination
LED Bulb 200 90 565 Room lighting
Wide Beam 300 120 1,257 Area lighting
Studio Light 2,000 45 1,570 Photography
Street Light 1,500 150 4,712 Road illumination
Headlight 800 25 134 Automotive
Downlight 350 40 218 Ceiling lighting
Track Light 600 35 329 Retail display
Pendant Light 250 80 442 Dining area
Under Cabinet 180 100 400 Kitchen counter
Sconce Light 220 85 415 Wall lighting
Torch Light 150 20 32 Handheld torch
Bike Light 120 45 95 Cycling safety
Emergency Light 90 110 218 Exit signage
Lantern 280 90 789 Camping gear
Reading Light 85 50 106 Desk lamp
Display Case 450 70 660 Museum lighting
Grow Light 320 95 714 Plant cultivation
Security Light 950 140 3,314 Outdoor security
Pool Light 180 160 1,006 Swimming pool
Christmas Light 25 180 196 Holiday decoration
Book Light 45 30 24 Clip-on reading
Vanity Light 160 75 281 Bathroom mirror
Black Light 95 55 130 UV effects
Disco Ball 420 170 2,490 Entertainment
Warning Beacon 1,200 30 601 Emergency signaling
Lighting Tip:

Remember that beam angle significantly affects total light output. A narrow beam might have high candlepower but low total lumens, while a wide beam distributes the same intensity across a larger area. Always consider both intensity and spread when selecting lighting for your application.