Light hood question - I just read in the Chickens for Dummies book that you should buy a light hood that has a ceramic socket instead of the plastic socket because the plastic will melt with high temps left on constantly. Anyone had issues with this? I just checked and the one I had was plastic - but so does the one that's in the beardie cage and it's never melted. We do just keep the beardie's light on about 15 hours a day and not 24 hours, so this made me wonder if it's something I should worry about.. anyone have any thoughts?