Who invented the first efficient incandescent light bulb that was later used in projectors?
Prompted by legislation in various countries mandating increased bulb efficiency, "hybrid" incandescent bulbs have been introduced by Philips. The "Halogena Energy Saver" incandescents can produce about 23 lm/W; about 30 percent more efficient than traditional incandescents, by using a reflective capsule to reflect formerly wasted infrared radiation back to the filament from which it can be re-emitted as visible light. This concept was pioneered by Duro-Test in 1980 with a commercial product that produced 29.8 lm/W. More advanced reflectors based on interference filters or photonic crystals can theoretically result in higher efficiency, up to a limit of about 270 lm/W (40% of the maximum efficacy possible). Laboratory proof-of-concept experiments have produced as much as 45 lm/W, approaching the efficacy of compact fluorescent bulbs.
Who invented the first efficient incandescent light bulb that was used in projectors?
Koninklijke Philips N.V. Philips
Incandescent light bulb
In 1859, Moses G. Farmer built an electric incandescent light bulb using a platinum filament. He later patented a light bulb which was purchased by Thomas Edison.
Who invented the first efficient incandescent light bulb that was later improved and eventually used in projectors?
Thomas Alva Edison Edison Thomas Edison
Incandescent light bulb
Electric light
https://en.wikipedia.org/wiki/Electric%20light
Incandescent light bulb
https://en.wikipedia.org/wiki/Incandescent%20light%20bulb
Arc lamp
https://en.wikipedia.org/wiki/Arc%20lamp
Movie projector
https://en.wikipedia.org/wiki/Movie%20projector
Historians Robert Friedel and Paul Israel list 22 inventors of incandescent lamps prior to Joseph Swan and Thomas Edison.[3] They conclude that Edison's version was able to outstrip the others because of a combination of three factors: an effective incandescent material, a higher vacuum than others were able to achieve (by use of the Sprengel pump) and a high resistance that made power distribution from a centralized source economically viable.
Incandescent light bulb
Although many people worked with incandescent light bulbs prior to Thomas Edison, he was the first one to make one with greater efficiency and resistance while being capable of withstanding a higher vacuum. This version was later improved on by Koninklijke Philips N.V., who invented the first efficient incandescent light bulb to be used in projectors.