Edit on 20. 8. 2014
I have now tried the closet to replace the cellar etc. my 40W incandescent bulbs with these bulbs, but had much less brightness.
I can understand the ratings, "replaces a 40W bulb" do not understand. This Eindruch arises verm. By the high proportion of blue (wavelength) !!!
The factory specifications 230 lumens agree certainly.
A 25W bulb equivalent to 220 lm
a 40W bulb equivalent to 415 lm
They consequently corresponds to (mathematically) about a 26,25W bulb.