Electrical reference chart
Lumen Footcandle Chart
Use this worksheet after the calculator result to document room area, task plane, total lumens, fixture count, average illuminance, foot-candles, lux, CU, LLF, and photometric follow-up.
Quick reference table
A lumen footcandle chart is a calculator-led planning worksheet for average illuminance. It keeps lumens, area, task plane, fixture count, CU, LLF, foot-candles, and lux together before the electrician compares the result with fixture spacing, lighting level targets, or a photometric layout.
Lumen to foot-candle worksheet
| Result item | Record from calculator | Field check before layout |
|---|---|---|
| Room or zone area | Square feet or square meters | Confirm the actual lit area and task plane height |
| Total lumens | Lamp, fixture, or room total | Check fixture count and delivered output per fixture |
| Average illuminance | Foot-candles and lux | Compare with the intended task or room target |
| Adjustment factors | CU, LLF, or none | Do not mix adjusted and unadjusted lumen results |
| Fixture count | Planned number of fixtures | Route to spacing, circuit load, and product review |
Illuminance result handoff
| If the result is used for | Keep this field visible | Next chart or review |
|---|---|---|
| Fixture count | Lumens per fixture and average fc | LED power lumen chart |
| Room target comparison | Task plane and planning target | Lighting level reference chart |
| Metric product data | Lux equivalent and area basis | Manufacturer photometric data |
| Circuit planning | Fixture count and input watts | Lighting circuit calculator |
| Final layout | Mounting height, spacing, reflectance | Photometric layout or field check |
How to use this chart
Start from the result
Bring over area, total lumens, target foot-candles or lux, task plane, fixture count, and any CU or LLF factors already used.
Keep units paired
Do not compare a foot-candle result from square feet with a lux result from square meters unless the conversion basis is documented.
Decide the next pass
Use the worksheet to decide whether the next step is fixture count, LED wattage, lighting level review, or photometric modeling.
Formula basis
Foot-candles = lumens / square feet. Lux = lumens / square meters. 1 foot-candle = 10.764 lux.
- Lumens are total luminous flux from the selected lamp, fixture, or fixture group.
- Square feet or square meters are the room, zone, or task-plane area used in the calculator.
- Foot-candles are lumens per square foot for U.S. planning work.
- CU and LLF are optional utilization and light-loss factors when the calculator result included them.
Worked examples
Open office average illuminance screen
Record a 1,200 ft2 area, 36,000 planned lumens, 30 fc average, 323 lux equivalent, fixture count, and whether CU and LLF were included before comparing fixture layouts.
Warehouse aisle task-plane note
For a storage aisle, keep the aisle area, rack shadowing note, target task plane, lumens per high-bay, and calculated average foot-candles together before photometric review.
Related calculators
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Illuminance Calculator
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Lighting Design Calculator
Preliminary lumen-method calculator for room lighting in feet, footcandles, lumens, and fixture count.
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LED Power Lumen Chart
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Frequently asked questions
These answers explain how to use the chart without turning a quick reference into a final design decision.