How to use this checklist
Answer the 6 questions on current bulb type, monthly electricity bill, daily hours of use, number of bulbs to replace, upgrade budget, and environmental priority. The scoring weighs all six roughly equally, but the first three — incandescent or halogen bulbs, high electric bill, and long daily usage hours — drive most of the payback calculation. Be honest about hours of use: kitchen, living room, and outdoor lights often run 6-12 hours a day and pay back fastest, while a closet bulb used 10 minutes a week will never recover its upfront cost. The environmental-priority question is real and counted, but it doesn't override the math by itself.
What your result means
65+ means LED is a clear financial win — your combination of inefficient current bulbs, high usage, and electric rate produces a payback period often under 12 months, with every subsequent year as pure savings. 35-64 means modest savings ($30-100/year typically); the smart strategy is replacing high-use fixtures first and swapping the rest as old bulbs burn out, rather than replacing everything at once. Below 35 means you're already efficient (CFL or LED), use lights sparingly, or have few fixtures — the upfront cost won't recover in a reasonable timeframe. Two reference numbers anchor the math: LEDs use roughly 75% less energy than incandescent and last roughly 25 times longer (25,000 hours versus 1,000), so a single LED prevents about 400 pounds of CO2 over its life versus the equivalent incandescent.
When to trust it
This quiz estimates financial and environmental benefit, not bulb quality or compatibility. Not all LEDs are equal — cheap, no-name LEDs often flicker, have poor color rendering (CRI below 80), shift color over time, or fail prematurely; look for ENERGY STAR or UL listings and a CRI of 90+ for living areas. Three compatibility issues trip people up: dimmable circuits require dimmable LEDs (and sometimes a newer dimmer switch — incandescent dimmers cause flicker or buzzing), enclosed fixtures (recessed cans, glass bowls) need LEDs rated for enclosed use or they overheat and fail, and some smart LEDs require a hub or stable Wi-Fi. For whole-home rewiring, recessed lighting installation, or panel upgrades to support new fixtures, hire a licensed electrician. CFL bulbs contain mercury and require special disposal — never put them in regular trash.