After spending over 100 hours on this project(any free time I would watching Netflix etc) and about £100 on paint paint masks and cans of spray I have a good result, well on the first test run.
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The reflector puts out 10,600lux @12" with a 6.1w led bulb( reduced a 13.3w bulb down to 6.1)
The disadvantage is the paint maximum temperature is 50c but I have tested the 6.1w bulb and they have not reached 40c( normally around 30c with good airflow, room temperature 25c)
lux per watt at 12", the bulbs are nearly 110% more effective vs 13.3w bulbs(no reflector)
It's been a lot of work but the results are really good, they are safe no chance of the foil coming lose and touching the chips etc
If I keep getting the same results I will use this on all my bulbs and move onto the next stage, build the lights, the arch light system was a total over kill, results are good but way too much light in the room.