I go a good deal on f GE 'curly' bulbs from CostCo about four years ago and put them in every fixture in the house. Some pointing up, some down and some sideways... Still waiting for one of them to pop... Quality must have dropped... Temperatures around here vary from -15F to 110F on average. - Dave G, KK7SS '65 MKIII Sprite, Richland, WA