Only been using a few days, but happy to have found these. Fluorescent strip lighting was giving me a headache (I’m very EMF sensitive) and I’ve so far not been getting a headache with these. I live in Scotland…every winter is ‘ughh’ and so I’m glad these bulbs can help with SAD. Nice that I can use them on daylight mode when I do my art and crafts and then I change to softer mode for sunset time and red light just before bed. I thought the box looked a bit ‘cheap’ looking (design!) for the product and said only 2 functions, but there are 3. Luckily, lots of info on Conscious Spaces website….but if it would have been for sale in store I’d probably have put it back on the shelf! The bulb is well made though…bigger than regular bulbs, so you may need a different lampshade.