1. Some have lower efficiency than filament lamps , and some significantly higher. 2. The early calculators used hundreds of CRT, cold-cathode Nixie tubes, and filament lamps . 3. In 1909, Osram began production of the most successful tungsten filament lamps in the industry. 4. In 1937, Meacham described using a filament lamp for automatic gain control in bridge oscillators. 5. The Mini Cooper S won the headlamp dimming circuit in place of a dual-filament lamp . 6. The lighthouse had a 1, 000 watt filament lamp with an intensity of 500, 000 Candela. 7. Edison's earliest steps in the bamboo filament and graphite filament lamps are displayed in this case. 8. Because of this, the lifetime of a filament lamp is a trade-off between efficiency and longevity. 9. Each socket took a miniature two-candela carbon-filament lamp . 10. Typically four filaments are used and the appearance is similar to an overrun carbon filament lamp .
