1.May i have some sample to test quality?
Yes you can,samples for free within 3 pcs,by express to your hand spend 3-7 days.While bulk order place, express cost will back you in that order.
2.For shipping,by express and by sea,which is better for me ?
Advice,quantity less than 500pcs by express is better,cause no any process it will coming to your hand directly;If order is bigger, by sea indeed.
3,How long is the producing time for 1 order?
Quantity within 1 container ,30 days. More 45 days.
4.Do you have CE Rohs ?
For main products bulb,,tube,yes we have.