Spotlight brightness to "useful lumens" measurement, wh […]
Spotlight brightness to "useful lumens" measurement, which is how the traditional light bulb brightness calculation is not much difference. The number of useful cavities is defined as the light falling within the 90 degree cone. We found that the useful light output you obtained at home may deviate from 25% of the packaging described above, so it is worth checking us to find the best spotlight to make sure you get as much light as the spotlight. As a rough guide, 300-400 lumens per square meter is recommended as a good ambient lighting level for the kitchen or corridor, and if you want brighter worktops, rise to 700-800 per square meter. Compared to LEDs, halogen tends to spill more light beyond the 90 degree taper, because they have filaments, rather than single points of light that produce light like LEDs. It is hard to see the eyes, but if you want to use the spotlight to pick a particular surface, or if you want a diffuse light to diffuse more, it's a matter to consider.
The beam angle you see on the box is defined as 50% of the total useful lumen output from the spotlight drop angle. If you want to select a specific surface, or even a picture on the wall, then you will need a narrow beam angle, and if you want to illuminate the larger area of the spotlight, you need a wider beam angle. Unlike traditional bulbs, a spotlight can illuminate a beam on a specific object or surface. They are particularly popular in the kitchen and corridor.
When we surveyed which? members in May 2014, we found that halogens were still more popular than LED spotlights, with 43% owning halogen spotlights compared to 28% owning LED. However, this trend looks to be changing with more and more of you making the switch to LED in large part due to the greater efficiency and lifetime claims that they offer. Below we explain the pros and cons of each, but for more information, head to our guide to LED light bulbs.