Brandon LED Vapor tight is made by new PC which is with good transmittance and tenacity .Because of choosing top material, It is with efficacy more than 125lm/w.On electronical design, there are 2ft 25W, 4ft 25W, 40W, 50WAmong all these wattages, 40W is the most popular one because it perfectly replaces 2X32 fluorescent light and give more light output! On the other hand, the electronical design is very stable, reasonable Parallel and series circuit design is adopted. So the product will work properly during its life span, and even though there is one chip failed in a light, the others will still work.BTW, The EM&sensor is suitable for this fixture as well. Besides those good characters, this product is already UL,cUL, DLC aproved.Let us save energy together on this product! ● Wattage:25w/40w/50w/60w/75w● Input Voltage:AC120-277V/AC347V ● Efficacy:125lm/w● CCT:3000K/4000K/5000K● Mouting: Surface,Suspended● Option:Dimmable,Emergency,Sensor● Certification:UL, cUL,CE,DLC ● Warranty:5 years