The two LED lamps were purchased to replace two conventional 20 watt lamps (G4) through a mirror cabinet in the bathroom. The brightness compared to the "old" bulbs is amazing, it is in the bathroom now much brighter than before. The color of the light is perceptually slightly "colder". The term "warm white" is still justified. Now we use instead of 40 watts only 8 watts. And it is even brighter. I can of course make no statement about the durability / lifespan. Right now I'm very happy with the product and can recommend buying fully. It should be noted just still that you have in the lamp holder have sufficient space for the LED (dimensions!). Who is on the optics arrives - a "beauty" they are not - that may make sure that it is "hidden" under a glass shade or similar are mounted... When you look for. B. from below to the top of the light bulb, I feel that not as disturbing.