Problem solved! Lights.com sells a string of 100 warm white LED lights with a timered battery pack to chicken farmers. The sales rep I spoke to emailed me the links. He said he's knowledgeable about the chicken winter lighting issue. http://www.lights.com/d-battery-box-with-timer-p-34410.html http://www.lights.com/warm-white-100-led-strand-for-connectable-string-light-systems-p-16823.html I am so happy to find these because I Googled many times and couldn't find anything similar, then one of the companies I called referred me to Lights.com.