As far as I know, the only numbers that are quoted with regard to Hue bulbs refer to the size and whether they are screw (ES) or bayonet fitting. There are two basic types: White, where you can only control the brightness, and Ambient White, where you can also control colour temperature. I have both types at home, and I'm very happy with them, but I'd say they probably aren't bright enough for an office environment, about equivalent to an old 60W bulb. You need to look at lumen output.