Replacing every bulb with LED: when it pays off and when it doesn't

Replacing every bulb with LED: when it pays off and when it's money down the drain

Is it worth replacing all the bulbs in your home with LEDs in one go? The short answer is no. The long answer depends on how many hours a day each one is on. A hallway that's lit for two or three minutes a day never recoups the investment; a living room or kitchen does. The consensus that's emerging is surgical: change only the high-usage spots and let the rest die out naturally.

The reasoning is obvious. An LED bulb costs roughly thirty times more than an old-style incandescent, so the energy savings have to make up that premium before the LED itself fails. And that's where the second problem comes in: not all of them last as long as the box promises.

Why cheap LEDs don't always pay off

Some argue that budget LEDs fail prematurely, and that branded ones, which supposedly last longer, cost a fortune that doesn't pay off with normal household use. The recurring impression is that LED bulbs in traditional E14 and E27 sockets aren't as well made as light fixtures that come 100% LED from the factory. One specific case: a batch of old filament bulbs bought at 20 cents each from an outlet, some of which have been failing without drama, because the alternative was paying thirty times more. And the ones that failed did so because of a bad socket contact, not the filament.

The full calculation, with the unit price, the stated lifespan and the actual hours of use, is where you decide whether a mass switch makes sense or whether you're just collecting underused bulbs in drawers.

Where the real savings are: timers and time-of-use rates

LEDs are the flashy part, but not the big one. With current tariffs, fixed costs carry the weight, and no bulb can fight that. Where you do notice a difference is in consumption: fitting timers to appliances that gulp power —a washing machine, an 80-litre electric water heater— and taking advantage of off-peak rates translates, according to one forum user's account, into bills 15 to 20 euros lower every two months. That is real money, and it doesn't require changing a single socket.

The list of measures that, according to participants, move the needle includes lowering your contracted power capacity, rationalising hot water use, raising the fridge to its maximum temperature and, if the kitchen is old and has a ceramic hob, switching to a cheap induction hob. LEDs are for the spots that are switched on for hours every day.

The staggered replacement strategy

The tactic that makes sense costs nothing upfront: put the new LEDs in the most-used areas and reuse the bulbs that were already there, still working, in the low-traffic spots. That way nothing gets thrown away and the savings start where they're most noticeable. When the old hallway bulbs burn out, replace them with LEDs, which get cheaper every year.

The technical nuance almost nobody looks at: brightness is measured in lumens, but a bulb's actual intensity is measured in candelas, and a narrow beam with lots of lumens can light up less than one spread across a sphere. Buying based on the big number on the box without checking the beam angle is the fastest way to end up with ugly, dim lighting.

In the end, the conclusion is the usual one: savings exist, but not where the advertising says. It's in the hours of use, not on the packaging.