I will be brooding a few ducks for the first time soon. In "Storey's Guide to Raising Ducks" Holderread recommends the use of blue bulbs in brooders to reduce eye strain and feather eating. However I keep seeing pictures of peoples brooders using red lights. A quick Google image search of "duck brooder" will show this. What is the best type of light to use in a brooder? How much does color really matter? Thanks!