The Feelux LSL1535K120V is a 15 watt 3500K LED fixture. The fixture is a very compact 35.24 x 0.89 x 1.48 inches. The LSL1535120V is 3500K which is soft white light. The fixture can be linked to others for a maximum of 400watts using the proper connecting cables. The LSL1535120V can replace the Hera ES34SW/BC or the Feelux NSL21W35K120VC fluorescent fixture saving 6 watts and the LSL1535K120V has a considerably longer life 40,000 hours.