Got my lux meter today,
Tested the new ati t5s and found that they were about 55000lux about 200mm below the lamps. Pretty bright for t5s. My 400w was about 71000Lux however dramatic drop when you move the meter 50mm away from the centre.
Also found it makes a bog difference which bulbs you use as the t5s supa white where much brighter than any other t5s bulbs,
The t5s put out a far better average of lighting over the tank. No wonder you see some awesome t5 tanks as a good t5unit puts out good lighting,