The LedLux Lucci lights have finally been fitted in my bathroom. What can I say, they're lights, they look good, the light from them looks a little cooler and somehow better than CFL, and they just work. Five of them in a room 4m x 2.5m lights it up like daytime, or at least bright enough that I doubt I'll ever wish for more light.
If lumens is a measure of area, i.e the full 360degrees, measured in a sphere and all light funnelled into a single point to measure light output in lumens, why is it that this same old measurement is appled to the new LED technology. This would work ok for Incandescents and CFLS, but for LED where there is minimal light pollution wasted in a backwards direction, why haven't we created a new lumen standard that accurately shows the brightness for the end user in the room? I have seen a lot of half lumen LED outshine a lot of 75Wbulbs lately because the LED is 180degrees. But as a consumer, now even lumens doesn't help me, I have to think of LED lumens as double the lumens than on the box, and its probably worse because now it also depends on the amount of backwards light spread from an LED, I don't want to be paying for light pollution into the roof :)
That is why they provide you with radiation patterns and usually a diameter and lux level for certain mounting heights, which is more useful to people that are installing or specifying lighting choices.
On 1 September 2010 the EU mandated LEDs must primarily be labelled in Lumen, not Watt. It is independent of the fixture, for example my 600 Lumen LED with 120 degree viewing angle in a recessed fitting provides the same illumination as a 100W incandescent in the same fitting, but not the same if in a pendant fitting. This is because the recessed fitting wastes a lot to the back of the bulb where the LED does not radiate.
A better measure would be Lux and illumination angle (or radiation pattern), so you know what light intensity you will get and spread over what angle.
I think you're at personal preference level here. I think it'll be bright enough to see easily, without making it a really bright room. I mostly use two 20W CF bulbs in my lounge 4x4 or 5.5m lounge, that's around 2200 lumens i think. My dining area's pretty huge, but above the table we have a single 20W CF bulb which does fine, that's around 1000 lumen I think.
Like I said before, 3000 lumens in a 4x2.5m mostly white bathroom room seems really bright, more than you'd want for general living.