I want to know the answer to the following question:
What is the theoretical maximum efficiency of reflective capsule bulbs?
All the background I'm provided with is that "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.". Is that enough to answer the question?
Answer: no