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SUMBAO led direct replacement tube We have a strong and professional customer service team who are an important part of our company. They have the abilities and strong expertise to promote our products, manage the negative emotion of customers, and provide professional customer's service at SUMBAO Lighting. We pay extra attention to the responsiveness and feedback to our customers, hoping to provide whole-hearted service that customers are satisfied.recessed led,6 led recessed lighting,4 inch led recessed lighting.