Good 40W incandescent bulb equivalent in size and light volume (450lm), part number A51KN, but a little more expensive than competing brands when bought at ~£20, though ~£15 at 2012-06-18 which undercuts them.

On duty in our smallest room, the light volume (40W equiv) and colour is fine, and it is simple instant-on as you'd expect. (The packaging claims 60W equivalence, as do many 7W/~450lm lamps.)

Rated at 10,000h, and also comes in an ES27 screw/spotlight version (A50KN).

A reviewer (HG) found it to be fine (reviewing along with an Istoria candle):

We replaced low energy bulbs in a table lamp and an ceiling 'uplighter' shade. As both provide subdued lighting rather than light to read by we were perfectly happy with the brightness. Their light seemed a fraction whiter than our existing bulbs and we were fine with that too.