The first coat of the white emulsion is on! We have bought two different brands of emulsion to find out which works better in the long run. Half the ceiling is done in Dulux Trade White Matt and the other half is done with B&Q Premium Brilliant White Matt. The same was done with the walls, the upper sections with Dulux and B&Q for the lower sections.
The first thing to report is that the viscosity of the B&Q is much greater and more substance gets loaded on to the brush or roller BUT it looks more transparent compared with the Dulux. We will wait until the morning to allow the paint to dry fully before the final comparison tests!
The cost benefit of the B&Q paint might not outweigh the quality we want but we will continue with the second layer of both paints and compare things again afterwards!
The light level of the patch of the wall (the same as the last light level tests) is about 110lux for the B&Q lower section and about 140lux for the Dulux upper section but this is probably not a fair test at all! The upper section is closer to the ceiling and the ceiling is reflecting more light towards the upper sections of the walls!! We tried to do a rough experiment using a hand held torch at a fixed distance from each wall surface but the readings were too small (only 7 to 8 lux!) and fluctuating too much. Oh well!