We are planning the lighting for our new milking parlour and calving pens and trying to understand the difference between an LED Batten fitting and an LED tube fitting. Our electrician has suggested that we go for a fitting with LED tubes so that at the end of its life we can simply replace the tube rather than fitting an unit that you have to replace the entire unit at the end of life. So can anyone share their experience and explain the difference and benefits of one type of unit compared with another? Is there a batten unit that you can just replace the light source at the end of life without having to change the entire fitting? Are we missing something?