Electrical reference chart
LED Power Lumen Chart
Use this worksheet after the calculator result to document watts, desired lumens, efficacy, driver input data, fixture count, runtime, circuit load, energy use, and product-data follow-up.
Quick reference table
An LED power lumen chart is a calculator-led planning record for fixture replacement and load comparison. It connects lumen output with input watts, efficacy, driver data, fixture count, runtime, circuit load, and kWh cost before procurement or a lighting circuit update.
LED power and lumen worksheet
| Input | Record from calculator | Follow-up decision |
|---|---|---|
| Desired lumens | Per fixture or total target | Compare with lighting level worksheet |
| LED watts | Calculated watts per fixture or group | Check driver input and circuit load |
| Efficacy | lm/W assumption or product data | Confirm with manufacturer datasheet |
| Fixture count | Number of units | Multiply for connected lighting load |
| Runtime | Daily or annual hours | Send to kWh and cost comparison |
LED replacement handoff
| Replacement question | Record on chart | Why it matters |
|---|---|---|
| Same light output? | Existing lumens and proposed lumens | Lower watts are not enough if delivered light drops |
| Same circuit load? | Input watts, driver current, quantity | Driver input controls branch-circuit load |
| Same visual result? | CCT, CRI, distribution, lens, glare note | A high-lumen fixture can still be uncomfortable or mismatched |
| Same operating cost? | Runtime, controls, kWh rate | Savings depend on hours and schedule, not watts alone |
| Same environment? | Damp, wet, high bay, enclosed, temperature | Listings and driver ratings can control product choice |
How to use this chart
Record the lumen target
Start with the required lumens per fixture or total room lumens from the calculator.
Record the efficacy basis
Document whether lm/W came from a default assumption, custom input, measured product, or manufacturer datasheet.
Route energy and circuit checks
Use fixture count, driver input, runtime, and watts to decide whether to update the kWh cost, lighting circuit, or project estimate.
Formula basis
Lumens = watts x lumens per watt. Watts = lumens / lumens per watt.
- Watts are input power per lamp, fixture, driver, or fixture group.
- Lumens are rated, delivered, or required light output documented for the result.
- Lumens per watt is luminous efficacy from the calculator or manufacturer data.
- Runtime and fixture count convert the watt result into connected load, energy use, and cost follow-up.
Worked examples
LED retrofit planning record
Record desired lumens per fixture, selected efficacy, calculated watts, driver input, fixture count, daily runtime, and whether the lighting circuit or kWh cost worksheet should be updated.
Warehouse high-bay comparison
Compare existing fixture watts, proposed delivered lumens, fixture count, mounting height, runtime, and circuit load before assuming the LED replacement is equivalent.
Related calculators
LED Power Calculator
Calculate LED lighting power consumption, energy savings, and replacement analysis
Lumen Calculator
Lumen calculator for watts-to-lumens, lumens-to-watts, lm/W efficacy, and simple room-lumen requirements.
Lighting Circuit Calculator
Calculate lighting loads, circuit design, and energy efficiency for optimal illumination
Related charts
Lumen Footcandle Chart
Use a lumen footcandle chart to connect room area, task plane, lumen output, fixture count, CU, LLF, foot-candles, and lux after a lighting calculator result.
Lighting Level Reference Chart
Use a lighting level reference chart to compare calculator illuminance results with task, room use, uniformity, glare, photometric data, and owner criteria.
kWh Cost Chart
Estimate energy-charge cost from kWh and rate, then separate simple usage cost from demand charges, time-of-use periods, and fixed bill items.
Frequently asked questions
These answers explain how to use the chart without turning a quick reference into a final design decision.