Halogen light bulbs produce light in a similar way as traditional (standard) incandescent lamps. However the way halogens work means they can produce more light using less electricity.
In other words, a halogen bulb can have the same light output (lumens) as a traditional (standard) incandescent lamp using less energy (Watts). This means it’s more energy efficient – though nowhere near as efficient as a CFL or LED.
For example, a traditional incandescent lamp using 60 Watts has the same light output (lumens) as a halogen using just 42 Watts. The halogen is more energy efficient… though nowhere near as efficient as a CFL or LED.
While halogen bulbs are more energy efficient and last a bit longer than traditional incandescent bulbs, they are still considered inefficient, expensive to run and short-lived compared to their alternatives. Before choosing any replacement bulb, make sure you consider and compare the lifetime costs of halogen light bulbs with more energy efficient options – don’t risk making a decision you may regret.