After birth, our calves are moved to individual pens with heat lamps. With four pens next to each other, it was a struggle to determine which cord went with the heat lamp for each pen, and we would often turn on the wrong heat lamp first. To solve this problem, we used Velcro leg bands of various colors to mark the lights, and we put a leg band of the same color by the plug. Colored electrical tape or zip ties could do the job as well. Now, we always plug in and unplug the correct light on the first try.
Jos Tuinier, The Netherlands