How to find a good led high bay light manufacturer ?

Nowadays , I found some new words , like led high bay light housing manufacturer in china , led high bay light company , high bay light supplier singapore , led high bay light suppliers . It seems some customers having trouble on finding good led high bay light manufacturer . With long-term survey , I discover some details about significant suppliers :

  1. Producing process with ISO9001-2015 certificated
  2. The factory workers have been trained professionally
  3. Products with correlating certifications , like CE , ETL , RoHS ,etc
  4. The warranty of lighting products