4.5 watts is just not enough for many areas, even with six of these lamps do I get my kitchen not really bright. Subjectively, the brightness corresponds to only a 20-watt halogen lamp. Also, 20 degrees beam angle for lighting too little, but the 35-degree variant has only 600lm brightness take 700 like this one (and is more expensive).
The printed package a switch from zero seconds advertised. This is incorrect. In fact, the lamp needs a little moment, until it is lit, perhaps half a second. That's not bad, but getting used to when mixed with conventional lamps. Nevertheless, the full brightness is immediately there.
The "warm white" to describe the product may according to the standard apply, for me the light color is definitely cold. Said kitchen now looks like illuminated with neon tubes, the contrast to the previous halogen lamps is considerably even after two weeks of familiarization time.
Too bad, until there is really good LED lights, you have to wait probably.