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Kinzey, B.R.; Perrin, T.E.; Miller, N.J.; Kocifaj, M.; Aubé, M.; Lamphar, H.A. |
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An investigation of LED street lighting's impact on sky glow |
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2017 |
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PNNL-26411 |
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Skyglow; Lighting |
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A significant amount of public attention has recently focused on perceived impacts of converting street lighting from incumbent lamp-based products to LED technology. Much of this attention pertains to the higher content of short wavelength light (commonly referred to as “blue light”) of LEDs and its attendant influences on sky glow (a brightening of the night sky that can interfere with astronomical observation and may be associated with a host of other issues). The complexity of this topic leads to common misunderstandings and misperceptions among the public, and for this reason the U.S. Department of Energy Solid-State Lighting Program embarked on a study of sky glow using a well-established astronomical model to investigate some of the primary factors influencing sky glow. This report details the results of the investigation and attempts to present those results in terms accessible to the general lighting community. The report also strives to put the results into a larger context, and help educate interested readers on various topics relevant to the issues being discussed. |
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Pacific Northwest National Lab. (PNNL), Richland, WA (United States) |
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GFZ @ kyba @ |
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2014 |
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Jurić M., Gaiduk M., Seepold R. |
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Influence of Illuminance on Sleep Onset Latency in IoT Based Lighting System Environment. |
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2019 |
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Bioinformatics and Biomedical Engineering |
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11495 |
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429-438 |
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Human Health |
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The exposure to the light has a great influence on human beings in their everyday life. Various lighting sources produce light that reaches the human eye and influences a rhythmic release of melatonin hormone, that is a sleep promoting factor.
Since the development of new technologies provides more control over illuminance, this work uses an IoT based lighting system to set up dim and bright scenarios. A small study has been performed on the influence of illuminance on sleep latency. The system consists of different light bulbs, sensors and a central bridge which are interconnected like a mesh network. Also, a mobile app has been developed, that allows to adjust the lighting in various rooms. With the help of a ferro-electret sensor, like applied in sleep monitoring systems, a subject’s sleep was monitored. The sensor is placed below the mattress and it collects data, which is stored and processed in a cloud or in other alternative locations.
The research was conducted on healthy young subjects after being previously exposed to the preconfigured illuminance for at least three hours before bedtime. The results indicate correlation between sleep onset latency and exposure to different illuminance before bedtime. In a dimmed environment, the subject fell asleep in average 28% faster compared to the brighter environment. |
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IDA @ intern @ |
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2555 |
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Dickinson, L.G.; Boselly, S.E.; Burgmann, W.S. |
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Defense Meteorological Satellite Program (DMSP) – User's Guide |
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1974 |
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ADA007678 |
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Remote Sensing |
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The capabilities of the spacecraft, sensors, and data processor for the Defense Meteorological Satellite Program are described. Many meteorological and geophysical uses of these data are examined, and examples used to illustrate the capabilities of the system to tailor the imagery for a large variety of present and future users. |
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AIR WEATHER SERVICE SCOTT AFB IL |
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2387 |
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Barrette, T.P.; Pike, A.M. |
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Closed-Course Human Factors Evaluation of Marking and Marker Visibility |
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2019 |
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Transportation Research Record: Journal of the Transportation Research Board |
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Transportation Research Record |
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2673 |
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10 |
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840-849 |
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Vision; Transportation; Raised retroreflective pavement markers; retroreflectivity |
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Raised retroreflective pavement markers (RRPMs) are commonly used to provide nighttime delineation of roadways. Although RRPMs are visible during dry conditions, they provide their greatest benefit during wet-night conditions, when typical pavement markings become flooded and lose their retroreflectivite properties. Naturally, the retroreflectivity of RRPMs degrades over time as a result of traffic, ultraviolet light, precipitation, and roadway maintenance activities. Subsequently, it is necessary to examine the relationship between driver performance and the condition of the RRPMs. To assess visibility relative to RRPM condition, study participants rode in the passenger seat of a vehicle operated by a member of the research team, traveling at approximately 15 mph, for two laps around a closed course. Throughout each lap of the course, nine treatments consisting of RRPMs or preformed pavement marking tape of various retroreflectivity levels diverged from a center line to either the right or left. Participants indicated when they could tell which direction the treatment diverged, which was recorded using a GPS unit. A generalized linear model was estimated on a dataset constructed by pairing the observed distances from various treatments with demographic information about each participant. The analysis indicates the distance at which a particular treatment would be visible, which can then be converted to preview time to assess treatment adequacy for a variety of speeds. The RRPM treatments generally provided adequate preview time for older drivers based on the extant literature; however, the preformed pavement marking tape was less adequate at higher speeds and under overhead lighting. |
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0361-1981 |
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2499 |
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Bullough, J.D. |
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Discussion of “Closed-Course Human Factors Evaluation of Marking and Marker Visibility” by Barrette and Pike |
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2019 |
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Transportation Research Record: Journal of the Transportation Research Board |
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Transportation Research Record |
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2673 |
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10 |
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850-851 |
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Commentary; Vision |
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0361-1981 |
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GFZ @ kyba @ |
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2774 |
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