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Microwave lamp characterization.

D E Ciolkosz1, L D Albright, J C Sager

  • 1Ag & Bio Engineering Department, Cornell University, Ithaca, NY 14853-5701, USA. dec9@cornell.edu

Life Support & Biosphere Science : International Journal of Earth Space
|September 7, 2001
PubMed
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The new SAA microwave lamp offers improved photosynthetic efficiency for Bioregenerative Life Support Systems (BLSS). It provides higher light output per watt and lumen compared to traditional lamps, with stable performance across temperatures.

Area of Science:

  • Plant photobiology
  • Bioregenerative Life Support Systems (BLSS)
  • Lighting technology

Background:

  • Bioregenerative Life Support Systems (BLSS) require efficient artificial lighting for plant growth.
  • Optimizing lamp spectral output and energy efficiency is crucial for sustainable life support.

Purpose of the Study:

  • To evaluate the operating properties of the SAA microwave lamp for BLSS applications.
  • To compare its performance against existing lighting technologies.

Main Methods:

  • Characterized lamp flux density, spectral output, and temperature response (-10 to +40°C) in a controlled environment.
  • Measured spectral output, radiant energy output, and intensity distribution.
  • Developed a model for lamp intensity distribution.
Keywords:
NASA Discipline Life Support SystemsNon-NASA Center

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Main Results:

  • The SAA lamp exhibits a spectral output similar to previous models but with higher photosynthetic efficiency per lumen and watt.
  • Radiant energy output was 0.399 W/µmol·s PAR, compared to 0.56 W/µmol·s PAR for high-pressure sodium lamps.
  • Lamp output decreased by ~0.4% per °C rise in ambient temperature, with minimal impact on light quality.
  • Intensity distribution provided uniform flux density within a 40° cone.

Conclusions:

  • The SAA microwave lamp is a viable and efficient lighting option for Bioregenerative Life Support Systems.
  • Its improved photosynthetic efficiency and stable performance make it suitable for space-based agriculture and other controlled environments.