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.

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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

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

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

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 recordRecord 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 comparisonCompare existing fixture watts, proposed delivered lumens, fixture count, mounting height, runtime, and circuit load before assuming the LED replacement is equivalent.

Assumptions. Balanced load and line-to-line voltage assumptions behind this chart.

The worksheet assumes the efficacy value is documented and not copied from an unrelated lamp or marketing claim.
Driver losses, dimming behavior, temperature, optical distribution, power factor, and product listing can affect the final equipment choice.
Delivered lumens, fixture distribution, and mounting height should be checked separately from simple watt-to-lumen arithmetic.

Code and standard notes. Planning limits that should be checked before final equipment selection.

Use this chart as a comparison worksheet; verify fixture listings, manufacturer data, driver ratings, adopted energy rules, circuit loading, and AHJ expectations before procurement or installation.

How to use this chart

1Record the lumen targetStart with the required lumens per fixture or total room lumens from the calculator.

2Record the efficacy basisDocument whether lm/W came from a default assumption, custom input, measured product, or manufacturer datasheet.

3Route energy and circuit checksUse fixture count, driver input, runtime, and watts to decide whether to update the kWh cost, lighting circuit, or project estimate.

Worksheet checklist. Record source basis, review gaps, and assumptions before using the chart result.

Capture watts and lumensWrite desired lumens, delivered lumens if known, calculated watts, selected efficacy, driver input, and fixture count.
Capture operating profileAdd runtime, schedule, controls, dimming, occupancy, and daylight assumptions before estimating kWh.
Capture product checksList datasheet, driver, color quality, distribution, environment, listing, warranty, and circuit-load items that remain open.

Common mistakes to avoid. Review these before turning chart current into an equipment decision.

Comparing LED products by watts only without matching delivered lumens and distribution.
Using a generic efficacy assumption for procurement without checking the actual fixture datasheet.
Forgetting driver input, dimming behavior, power factor, and fixture count when moving from one fixture to a branch-circuit load.

Frequently asked questions

These answers explain how to use the chart without turning a quick reference into a final design decision.

Is a higher lm/W value always the better fixture?

Not always. Efficacy matters, but distribution, glare, color quality, dimming, environment, warranty, and listing also affect the correct choice.

Can the watt result be used for circuit load?

It can start the circuit load worksheet when the input watts and fixture count are documented, but controls, driver data, continuous-load treatment, and code review still matter.