I noticed that the Bake around ain't alot more exspensive then the candle tubes,they are on ebay for 12 to 15 bucks plus shipping and handling and the candle tubes are $6.78 and the glass on the bake arounds seem to be much thicker then the Candle tubes I used? will the thickness of glass impede some of the lumens?????........is the bake around real glass? or a plastic?