Halogen lamps, explained by RP Photonics Encyclopedia; operation temperature, halogen cycle, luminous efficacy, energy efficiency
Halogen Studio Lamp Spot Light Bulb T26 Gy9.5 650w Halogen Quartz Bulb Lamp For Digital Photography 3200k Video Lamp - Professional Lighting - AliExpress
Guide to Buying Halogen Light Bulbs - The Lightbulb Co. UK