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Different Light Bulb Sizes, Shapes and Codes | Light Bulb Size Chart - ElectronicsHub
Light Bulb Types: How to Choose the Best Light Bulbs
Powers Electrical Solutions, Inc - Do light bulb types confuse you? You're not alone! Check this out...BT (Blown or Bulbous Tube) Type HID Bulbs (Code: ET) BT means Blown or Bulbous Tube. (
Sylvania 67543 - LU1000/SBY High Pressure Sodium Light Bulb - High Intensity Discharge Bulbs - Amazon.com