The Lighting Environment
Test Facility (LETF) is located at NASA Johnson Space
Center. Its role is to investigate and evaluate proposed
lighting systems for use on space vehicles to enhance
the crews' direct and indirect viewing. This effort
includes the investigation, measurement and analysis
of:
Artificial lighting systems such as docking lights,
portable lights and navigation lights
Reflective characteristics of various materials
and the effects of solar lighting
Transmission characteristics of transparent materials
used for visors, displays and windows
Camera performance for minimum and maximum illumination
In addition, LETF is
active in the research and development of new and
advanced technologies such as solid-state luminaires,
photo-luminescence technology, radio-luminescence
technology and the computer modeling of light. Working
in conjunction with the Graphics Research and Analysis
Facility, the LETF uses tools such as illuminance
and luminance meters, colorimeters, gonio-reflectometers,
special purpose luminaires, scale models and computer
modeling to perform its analyses and predictions.
