I had to replace some 50W GU10 halogen bulbs. I though it could be time to check if it would be reasonable to go to use LED bulbs. I did a year or so similar checking, and at this time it did not feel reasonable because reasonably prices LED bulbs gave considerably less lights out than the original bulb and the only few that would nearly match the original light output were very expensive.
Nowadays the market seems have updated to a point where LED seems to be reasonable. There is wide variety of reasonably priced LED light bulbs on the market. And it seems to be possible to find reasonably priced bulb that gives out around same amount of light as the original 40-50W halogen bulb. But I need to understand the specifications that I really get what I want.
Look at the Lumen value when you’re buying a bulb. The higher the rating the brighter the light! A standard 50W halogen lamp outputs 400 lumens so you probably need a 4-5W LED bulb with very efficient LED. With some slightly less efficent LEDS 7 or 10 watt LED will give a similar light to a 50 watt halogen. But just looking at the watts on the LED bulbs does not tell the light output because different LED types have different light output at same input power. Look at the Lumen output the LED bulb gives.
It is possible to get same amount of light than with original halogen if you pick right product. Here is a video that shows that Dauer 5W Cree XPE Chip Based GU10 lamp can give out 20% MORE light than does the 50W Halogen lamp (and uses just tenth of energy):
Besides the Lumen you need to consider other factors like light color temperature and other bulb design details. For LED lamps there are color temperatures typically named “warm white” (~3000K) and “cool white” (~5000K). Generally “warm white” is what is what you need for normal home use. “Cool white” is very white in color. There are no absolute rules – the choice is about personal preference and use. If you like the traditional yellowish colour of a conventional lamp then warm white around (2700-3000K ) would be the ideal choice, this is the most popular choice for homes. For modern clean look with bright feeling you might also consider a cool white lamp (4000-5000K). Cool white could also be reasonable choice for kitchen, study, bathroom, cupboard, office, retail.
There is also difference in how the constant the light output on different LED light bulbs is. Some LED bulbs give pretty constant light outputs, and the light from some LED bulbs can flicker considerably. If you are sensitive to flickering lights, this may be important information to you before you spend a lot of money on them.
Check also the lamp design, different LED bulbs will look pretty different outside. There can also be difference on the beam shape they give (how wide beam) and how well the light shows different colors (color rendering). Go into a wholesaler and ask if they have a display of different lamps. LED light output will always look a little different than original halogen bulb: No LED lamp will have the same ‘sparkle’ as halogen.
If your light system uses light dimmer, you need to also check that the LED light bulb you are selecting supports light dimming. Many LED light bulbs are not designed to be dimmed and some designed to be dimmed might not work with all light dimmers.
Finally keep in mind the safety issues. Buy good quality bulbs that do not cause electrical hazards or interference problems. A bad quality LED bulb can cause electrical shock to you in a way or another.
It is also possible that bad electronics inside bulb can start fire. So get LED bulbs with well built electronics. A well built LED bulb is safer against fires because LED lamps have in all parts very much lower temperatures than halogen bulb (very hot halogen bulb is a real fire hazard if not properly installed).
Here is a video on selecting LED bulb to replace a GU10 Halogen Spot:
Now you have information to make your own informed choices on LED lighthing. With this information I was ready to go to shopping LEDs to replace halogen bulbs.