Question: What company first marketed light bulbs using the reflective capsule technique to increase energy efficiency?
Answer: 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).
 Is the question answered in a satisfactory fashion?
yes