The white mode is brighter than the previous bulbs I was using. The supplied bulbs were rated at 470 lumins, not 400 as stated on eBay. The colour modes are only around 10-20% as bright however; for example the "Grassland Green" scene mode is a grassland at dusk.
One issue I found was that turning off my three bulb light fitting at the wall results in only two of the bulbs reconnection to my router (a BT Smart Hub 1) when powered on again. I have to remove the effected bulb from the fitting and reinsert when the light is on for it to reconnect. This seems to be a limitation of my router being unable to accept more than two connection requests at a time and other routers may fair better. Turning the router's 2.4Ghz WiFi off and on again will also fix this as the router is then in control of the reconnection process. As I leave the switch on all of the time, this isn't usually a problem.
I purchased 2 of these bulbs for my 12 year old sons and they love them. They use their mobiles to change the settings with ease. They often select the auto colour change mode while doing their homework, which they like. Happy boys