Lighting
LED Strip Power Supply Calculator
The purpose of LED Strip Power Supply is to turn LED strip load and capacity factor into minimum supply rating. Keep the source condition with the saved result so later comparisons remain meaningful.
Run the LED Strip Power Supply scenario
Replace the examples with values from the same case.
From inputs to result
Start with the equation supply = load × factor. The entered quantities are LED strip load and Capacity factor.
The defaults produce 143.75 W. Replace them with measurements from one operating state.
Calculate minimum supply rating from LED strip load and capacity factor. For the companion strip power calculation, open LED Strip Power Calculator.
Measurements and entries
Use photometric data for the actual fixture, optic, mounting height, and task plane. Write down whether each entry is measured, rated, assumed, or calculated.
Check every prefix before entry; micro, milli, kilo, and mega are not interchangeable. Use Continuous Load Capacity Calculator as the companion source for minimum circuit rating.
- LED strip load
- Default example: 115 W. Enter LED strip load in W.
- Capacity factor
- Default example: 1.25. Enter capacity factor.
Applying the result
Use Minimum supply rating as one quantified check within the larger decision. Compare it with initial, maintained, and worst-case lighting conditions.
Store the measurement state and conversion notes with the answer. If you also need voltage loss, continue with LED Strip Voltage Loss Calculator.
Assumptions and limitations
Use the supply manufacturer loading guidance.
Additional checks may be needed for driver efficiency, optical loss, surface reflectance, and beam-edge definition. Use measurements, manufacturer data, or another calculation for effects that can change the decision.
Use photometric data for the actual fixture, optic, mounting height, and task plane.
A second scenario
Change LED strip load from 115 W to 138 W and preserve the rest of the case. This moves the answer from 143.75 W to 172.50 W.
This isolates one variable; a real system may change several at once.
Documenting the calculation
Document LED strip load and capacity factor with minimum supply rating. Keep enough context to reproduce the result later.
Transfer minimum supply rating unchanged when passing it to the next worksheet. Apply standard sizes only after all checks are complete.
Before relying on the answer
What should I verify beyond the displayed inputs?
Use the supply manufacturer loading guidance. A broader review should include fixture distribution, reflections, mounting, maintenance, and meter position.
Why might a second instrument give another answer?
Differences can come from daylight variation, control behavior, depreciation, and spatial uniformity, measurement uncertainty, or values taken under different conditions.
Can I change several inputs at once?
Use separate labeled cases when more than one condition changes. Record reflectance, maintenance condition, beam definition, and measurement location.
Can I select equipment from this number alone?
Use the number as one check, then review initial, maintained, and worst-case lighting conditions.