I'm not sure, but 1W LED lights shouldn't be more than $10 (mine were $7,50 iirc). I could say it took me 1 month, but that wouldn't be entirely fair since I have significantly reduced the lighting and changed the way I use it. Something which I probably would not have been able to do by, for example, reducing the number of lamps since that creates an annoying bright/dark distribution of light)