Context: Prompted by legislation in various countries mandating increased bulb efficiency, new "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.

Question: Which company introduced hybrid incandescent bulbs?
Answer: Philips

Question: How much more efficient are Halogena Energy Saver bulbs compared to incandescents?
Answer: 30 percent

Question: What company first marketed light bulbs using the reflective capsule technique to increase energy efficiency?
Answer: Duro-Test

Question: What is the theoretical maximum efficiency of reflective capsule bulbs?
Answer: 270 lm/W

Question: What is the maximum efficiency of reflective capsule bulbs as tested in labs?
Answer: 45 lm/W

Question: Which company did not introduce hybrid incandescent bulbs? 
Answer: Unanswerable

Question: What did not prompt Philips to introduce the hybrid incandescent bulbs? 
Answer: Unanswerable

Question: What can produce about 25 Im/W?
Answer: Unanswerable

Question: What is 40% less efficient than traditional incandescent?
Answer: Unanswerable

Question: Which concept was not pioneered by Duro-Test in 1980?
Answer: Unanswerable