Conventional light bulbs (also known as incandescent lamps) convert rather less than 20% of the electricity they consume into actual light. This is because they quite literally burn a thin metal filament and as with all burning, most of the electricity is wasted as heat. To suggest they’re not therefore particularly good at doing the one thing they’re supposed to do (i.e. turn electricity into light) is understating things somewhat.

As diminutive heaters, regular light bulbs are actually quite good, but unfortunately this heat is typically lost somewhere completely unhelpful like the ceiling; also if you want instead to keep the temperature down then they simply make your air conditioning work harder. However you look at it, you are spending good money on heat you most likely didn’t want and getting a rotten deal on light into the bargain.

Energy saving or “low energy” light bulbs that are significantly more efficient have been available for quite a while now. These mostly take the form of compact fluorescent lamps (CFL) and are currently the most commonly available type of energy saving bulb for the domestic market. CFLs have not really caught on though, most probably because they’re oversized, take a noticeable amount of time to reach optimum brightness and are expensive by comparison with incandescent bulbs. Despite some improvements to make CFLs more discrete, attain full brightness in less time, and reduce the price but there is no hiding the fact that they have a poor image, which is not helped by the fact that they also contain poisonous mercury vapour and are thus not easy to dispose of in an environmentally friendly way.

The new breed of energy efficient light bulbs are based on light emitting diodes (LED). These are massively more energy saving than today’s CFLs but until fairly recently have not been quite bright enough for regular home lighting.

However LED bulbs recently appearing in the market are indeed available as genuine alternatives, and in particular those made as substitutes for GU10 and MR16 halogen lamps. But anyone thinking about going down this path should also know that a lot of white LED bulbs, and in particular ones described as “cool” as distinct from “warm” white) may appear slightly blue which some folk find fairly attractive but which generally do tend to stick out rather if mixed with other kinds of lighting.

There is no doubt though that far and away the main advantage of LED lights is that they turn nearly all their input energy into light and waste virtually none as heat which quite simply means that they require a great deal less energy in operation. Approximately 10 times less, which represents a massive saving in expenditure because the cost of electric lighting is almost totally due to the operating cost. The cost of the actual light bulbs is really quite trivial by comparison.

It’s also a fact that LED lights last twenty or more times longer and thus require replacing much less often. The advantages should be fairly plain then; LED lights not only save you money, they also aid the environment. The manufacturing process is more straightforward than for CFL bulbs and there are no unpalatable disposal headaches.

But the biggest environmental impact is down to the fact that because they consume less energy then less energy has to be produced which in turn means less CO2 emissions.

As should be clear from this article it’s difficult to see what’s not to llke about GU10 LED lamps; to learn more review this article about replacing halogen bulbs with LED.