Ceramic bulbs emit only heat ensuring that chicks have a natural growth rate and aren't kept awake 24hrs a day. Red light bulbs draw vitamin A from growing chicks which can result in 'curly toe' and other bone disorders. This MS dull emitter has the same quality (if not better) as the well known brand "Elstein" but is cheaper -applicable in moist surrounding -innovative design -ultra long lifetime : 20.000 hours -Emits "sun-like" warmed -99% heat efficiency