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LED Tube Calculators

Free tools for facility managers, electrical contractors, and B2B buyers. Calculate ROI, energy savings, fluorescent replacements, utility rebates, and lighting levels.

These LED tube calculators help B2B buyers and facility managers quantify the financial and environmental impact of switching from fluorescent to LED tubes. The ROI Calculator calculates payback period and 10-year NPV including utility rebates. The Fluorescent Replacement Guide maps every common fluorescent model (F32T8, F40T8, F28T5) to its LED equivalent. The Utility Rebate Estimator shows DLC QPL rebates by state ($5–$30/fixture). All calculators are based on real-world data from DLC, IESNA, EPA, and EIA.

ROI Calculator

Calculate payback period, 10-year NPV, and utility rebate impact for your LED tube retrofit.

payback periodnet costannual savings10-year NPV

Energy Savings Calculator

Calculate annual kWh savings, dollar savings, and CO₂ reduction when switching from fluorescent to LED.

kWh savingscost reductionCO₂ impact

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Fluorescent Replacement Guide

Find the exact LED replacement for F32T8, F40T8, F17T8, F28T5, F54T5HO and more.

F32T8F40T8F28T5Type A/B

Lumens ↔ Watts Calculator

Convert lumens to watts or watts to lumens. Includes T8 & T5 LED efficacy reference chart.

lm/W efficacyDLC Premium140 lm/W

Utility Rebate Estimator

Estimate DLC QPL utility rebates by state. Compare DLC Standard vs Premium rebate tiers.

DLC rebatePG&ECon Edison$5–$30/fixture

Foot-Candles ↔ Lux

Convert between foot-candles and lux. Includes IESNA recommended levels for all space types.

IESNA standardsoffice 30–50 fcwarehouse 10–30 fc

Frequently Asked Questions

How do I calculate the ROI of switching to LED tubes?

Enter your fluorescent wattage, LED wattage, number of fixtures, operating hours, electricity rate, LED cost, and utility rebate into the ROI Calculator. It outputs annual savings, net cost after rebates, payback period (years), and 10-year NPV. Most commercial retrofits achieve payback in 1.5–3 years.

What LED tube replaces a F32T8 fluorescent?

A T8 4ft 15W LED tube replaces F32T8 (32W). Same G13 bi-pin base. Saves 17W per fixture (53% energy reduction). Use the Fluorescent Replacement Calculator for a complete guide covering F32T8, F40T8, F17T8, F28T5, F54T5HO, and more.

How much is the DLC utility rebate for LED tubes?

DLC-listed LED tube rebates range from $5 to $30 per fixture by state. California: $10–$30/fixture (DLC Premium). New York: $8–$25/fixture. Texas: $5–$15/fixture. Use the Utility Rebate Estimator to calculate total rebates for your project.

How many lumens is a 15W LED tube?

A 15W T8 LED tube produces 2,000–2,250 lumens (130–150 lm/W). DLC Premium grade: 2,100–2,250 lm (140–150 lm/W). Use the Lumens to Watts Calculator to find the right wattage for any required lumen output.

Browse by Specification

18W LED Tube 4ft T8 LED Tube 5000K LED Tube DLC Listed LED Tube IP65 LED Tube CRI 90 LED Tube