Dear Shimada,
Good morning!
Regarding to the defective problem,our answer as below:
1.We will send you 62pcs bulb for replacing;
2.Referred to the flicking,it is easily for you to recognize by eyes.Please check the quantity of that and we will send you the replacement,or we send you 10pcs for spare;
3.About the shipping cost,usually we don't afford for it.Could you use your stock for installation first and we send with your next cargo?
Hope you can understand our situation.
Any question please feel free to contact with me.