TC 6-66: Maintaining summer levels of 25OH vitamin D during winter by minimal exposure to artificial UV sources; requirements and weighing the (dis)advantages
- Lack of available UVB radiation in sunlight leads to a seasonal cycle in vitamin D status in populations living at middle – high latitudes. When combined with a modern diet and lifestyle this can lead to undesirably low vitamin D status in the winter months. The TC will explore the evidence for maintaining summer vitamin D status, and whether this can safely be achieved by regular, controlled UV exposure (as defined by EN60335-2-27).
- Chair: Ann Webb (GB)
TC 6-64: Optical Safety of Infrared Eye Trackers Applied for Extended-Duration
- To review the potential optical radiation hazards from infrared eye-tracking systems when exposure durations are continuous throughout the day. Emphasis is placed upon the use of eye-tracking for gaze-based communication for severely disabled persons, which requires exposure of the eyes throughout a day over many years. Although there exist exposure guidelines from the International Commission on Non-Ionizing Radiation (ICNIRP) for infrared exposure and a CIE Standard (S-009) for photobiological safety of lamps and lamp systems, the lengths of exposure employed in this type of interface technology for disabled users may exceed the durations envisioned in the current exposure guidelines and standards. Abnormalities in the eye behaviour of severely disabled users may also require special treatment in safety standards.
- Chair: David H. Sliney (US)
TC 6-63: Photobiological Strategies for Adjusting Circadian Phases to Minimize the Impact of Shift Work and Jet Lag
- To evaluate currently available biological research data relating to chronobiological effects and neuroendocrine effects, to include alerting effects with the aim to develop strategies for countering the effects of shift work and jet lag, as well as other sleep-wake disorders. The report shall provide guidance to the lighting community for assessing the impact of different light sequencing and spectral distributions of lighting for the environments where this can be used for humans. The historical studies of chronobiology will be briefly mentioned to provide a historical perspective.
- Chair: Steven W. Lockley(US)
TC 6-62: Action Spectra and Dosimetric Quantities for Circadian and Related Neurobiological Effects
- To evaluate currently available biological research data relating to action spectra for human neuroendocrine effects, alerting effects and chronobiological effects with the aim of providing guidance to the lighting community for assessing the impact of different spectral distributions of lighting upon non-visual effects in humans. The historical studies of chronobiology will be briefly mentioned to provide a historical perspective. The eventual aim will be to provide a recommended standard action spectrum (or spectra) for melatonin suppression and for assessing the health impact of light. Dosimetric quantities related to biologically effective radiance and irradiance will also be developed.
- Chair: H. Cooper (FR)
TC 6-61: Measurement of Radiation Using the Phytometric System for Plant Application
- To prepare a document intended to provide growers, lamps manufacturers, greenhouse and growth-chamber designers, lighting engineers, architects and plant scientists and engineers with a concise reference for the use of the phytometric system for measuring radiation for plant photosynthesis and related processes.
- Chair:Gilberto da Costa (BR)
TC 6-52: Proper Measurement of Passive UV Air Disinfection Sources
- To specify the biologically meaningful measurement distances and positions in installations of UV germicidal lamps for open, upper-air disinfection. Physical aspects of the measurement will be coordinated with CIE Division 2.
- Chair: Richard L. Vincent (US)
TC 6-49: Infrared Cataract
- To evaluate current biophysical data related to infrared and heat-induced cataractogeneses and report on the potential mechanisms - both thermal and photochemical.
- Chair: Tsutomu Okuno (JP)
TC 6-45: Optical Radiation Hazard Measurements in the Workspace
- To examine the methods of measurement and the required accuracy of field instruments and broad-band meters used to measure the optical radiation hazards in the workplace. Emphasis is on UV and blue light hazards. To develop approved (recommended) methodsor measurement of UV, visible and IR in the workplace.
- Chair: R. Angelo (US)
TC 6-42: Lighting Aspects for Plant Growth in Controlled Environments
- To define the general prerequisites for growing terrestrial plants in controlled environments and the characteristics of both commercial and research facilities. To discuss the economic constraints of commercial production facilities, and the critical optical radiation parameters for successful culture. To examine the interaction of optical radiation with other environmental parameters. To identify new and current optical sources suitable for plant culture.
- Chair: Mojtaba Navvab (US)
TC 6-37: Light and Retinal Disease
- To prepare a report on the current state of knowledge regarding the alleged effects of light exposure as an etiologic factor in retinal disease. The report should be written to be understood by the lighting engineering community.
- Chair: David H. Sliney (US)
TC 6-28: Standardization of Sunscreen Testing: Method for UV-A sunscreen testing
- To develop standardized specifications for the spectral distribution of light sources used in testing sunscreens based upon the report of TC 6-12 as CIE 90-1991.
- Chair: Uli Osterwalder (DE) (This TC is working on a standard.)
TC 6-21: Low Lewel UV-A Cataract
- To inform the lighting engineers about the basic facts concerning eyelens cataract and, in particular, the role of exposure to the UV radiation. Particular emphasis is to be given to the controversies concerning the effects of day-after-day accumulation of small UV-A radiant exposures.
- Chair: David H. Sliney (US)
TC 6-08: Guidelines for Obtaining Action Spectra Definitions
- (detector, effective radiant quantities, responsivity, spectral responsivity, action spectra, threshold radiant exposure, threshold exposure period). Bunsen-Rosoce law; type of detectors; general relation between effect and irradiation; principles of obtaining action spectra; monochromatic irradiation; sources (random parameters); measurement of irradiance on the detector; measurement of the effect of irradiation.
- Chair: David H. Sliney (US)
