KANDOlite LED T8 INSTAlite DLC & ETL Plug and Play 17W 4000K - UL Type A - LED Tube Length 4ft 110-277V - 4-Pack Perfect retrofit traditional lamps for INSTANT START ballast circuit Energy saving up to 46% compare to F32T8 system No mercury and hazardous substances Good colour rendition, CRI &gt;= 80 No rewiring cost