It is just as good as any other 6W 4000K (cool white) 400 lumen lamp. If you have a luminaire that uses a E14 fitting then it should be fine.
Actualy not at all, not for our purpose.. Depends how you look at them, i wont say utherly useless because plants grow under this light. But looking at it from aesthetical perspective the colors look worse than awfull. For growing some letuce in a dark corner of the house they might just do fine, used above a display piece it looks like plants in the red light district display cabin. Than you are at risk of Dirty Old man ringing at your door asking the price and who's in.Or not?
The plant doesn't mind, it will grow either way.. These so called grow lights are aimed towards the light output the plants need the most, red and blue. If or what the plant does with the rest of the spectrum is fairly unknown to us. Than if you design a light with 6 watt consumption and 400 lumen, than divide this number over the light the plant uses than you have more usefull light from the plants perspective. Because a 6 watt 400 lumen white light has the same strenght in output but less red and blue.I just thought that as these are advertised as specifically for cultivation they may be ok.