Payback in plain terms
Most owners judge a lighting retrofit by simple payback: the project cost, less any incentives, divided by what it saves each year. If the answer is a few years and the building will be in use much longer, the project usually makes sense.
No one can give you an honest payback number without looking at your site. Two buildings with identical fixtures can have very different results because they run different hours and pay different rates. What we can do is show you which inputs matter most, so you can judge any quote you receive.
Hours of operation: the biggest lever
A fixture saves energy only while it is on. Lights that run around the clock pay back far faster than lights used a few hours a day. Before anything else, find out how many hours each area is really lit.
| Space | Typical run time | Payback effect |
|---|---|---|
| Parking garage, stairwells, 24 h warehouse | Always on | Strongest |
| Retail floor, two-shift plant | Long days, most of the week | Strong |
| Office open area | Business hours | Moderate |
| Storage room, meeting room | Short, irregular | Weak unless paired with sensors |
Inexpensive light loggers can record when fixtures are on for a couple of weeks. That data often reveals lights left on overnight, which is also an argument for controls and sensors.
What you are replacing and what you pay for power
Existing wattage. The bigger the gap between old and new, the faster the payback. Metal halide and high-pressure sodium high bays, T12 fluorescents, and halogen track lights are the best candidates. Newer T8 or T5 systems already in good shape save less, though maintenance savings may still tip the balance.
Your rate. An Alberta power bill has an energy charge plus transmission, distribution and other charges. Some are billed per kWh and some, on larger commercial accounts, are based on peak demand in kW. Cutting lighting load can lower both. Use your own recent bills, not an average from the internet, because rates and contracts vary widely and change over time.
- Look at the per-kWh charges together, not just the energy line.
- If you are billed for demand, ask how much of your peak is lighting.
- Remember that heat from old lighting helps a little in winter and costs you in summer cooling, so the net effect is usually small.
Maintenance savings people forget
In high ceilings, the lamp is often the cheapest part of a relamp. The lift rental, labour, after-hours scheduling and lost floor time can cost far more. LED fixtures last much longer than metal halide lamps or fluorescent tubes, so those trips mostly go away for years.
- Count how often you relamp now and what each trip involves.
- Include ballast failures, which are common in older fluorescent fixtures.
- Include disposal. Fluorescent tubes and HID lamps contain mercury and must be recycled. Very old ballasts may contain PCBs and need special handling.
Ballast bypass and fixture conversions put line voltage on new connections inside the fixture. They need to be done and labelled properly, and in Alberta they may need a permit depending on scope.
Retrofit options compared
How you convert a fixture changes the upfront cost, the efficiency and the future upkeep.
Plug-and-play tubes are quick but you still own an aging ballast. Ballast-bypass tubes remove that weak link. A retrofit kit or a new fixture costs more, but delivers the best efficiency, a new warranty from the manufacturer and better light quality. For metal halide high bays, a new LED fixture is usually the right answer. See our warehouse high-bay guide.
Controls, incentives and the long view
Adding occupancy sensors, daylight dimming or scheduling reduces hours, the biggest lever of all. The control cost is often modest when fixtures are already being replaced.
Incentive programs in Alberta come and go, and they may be offered by different levels of government or by utilities. Check what is open when you plan the project and apply before you buy, since many programs require pre-approval.
A lighting energy audit pulls these numbers together for your site, and our LED retrofit service handles the work with minimal disruption.
Common questions
How long does an LED retrofit take to pay back?
It depends mostly on operating hours, the wattage of the old fixtures, your electricity charges and maintenance costs. Long-running spaces with metal halide or T12 fixtures pay back fastest. An audit of your actual site is the only reliable way to get a number.
Is it worth replacing T8 fluorescents that still work?
Sometimes. The energy savings are smaller than with older lamps, so the case often rests on long hours, maintenance savings, adding controls, or a renovation that is happening anyway.
Are plug-and-play LED tubes a good idea?
They are quick and simple, but you keep the old ballast, which will eventually fail and add a service call. For longer-term value, ballast-bypass tubes or retrofit kits are usually better.
Can the retrofit be done while we stay open?
Usually yes. Work can be phased by area or scheduled after hours, and we plan around your operations.
Codes and permit rules change and every building is different. For work on your system, talk to a licensed electrician and your local permit authority.