It flicked originally before changing bulb. So, coupler should be defective.
For the rest of 37 sets which turned green, there is no way for us whether they are flicking or not. It is not easy to find it from floor.
This is not problem that we only replace for the defectives. Since defective rate is more than 60%, the possibility of defective for the rest should be very high before warranty period.
In this case we need to replace all of them. Otherwise customer will not accept.
There is one more thing need to discuss. If we replace parts only, it will take extra 3 days for replacing as we need to disassemble each lighting first, and it will cost us another USD700/day including lift.
If you can replace as set, we can finish it in 1 or 2 days.
Please choose whether you replace parts but pay for extra USD2100, or replace as set.
In case of parts replacement.
1. coupler + bulb x 61 sets
2. coupler + bulb + ballast x 1 set
Best regards,
Shimada