The objective of the proposed experiments is to study the effect of lighting intensity and spectral composition (correlated colour temperature) on thermal comfort and thermo physiology. The obtained insights can be used to improve thermal comfort,…
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Brief title
Condition
- Other condition
Synonym
Health condition
verkrijgen van inzicht in de interactie tussen licht, thermisch comfort, fysiologische respons en alertheid van mensen
Research involving
Sponsors and support
Intervention
Outcome measures
Primary outcome
Experiment 1
The primary objective of the first experiment is to obtain insight in the
effect of the lighting intensity (experiment 1a) and the spectral composition
of lighting (experiment 1b) on thermal comfort and sensation, whole body energy
expenditure and alertness. This effect will be tested under thermo neutral,
mild cold and mild warm conditions.
Experiment 2
The primary objective of the second experiment is to obtain insight in the
effect of the lighting intensity and the spectral composition of lighting on
thermal comfort and sensation, whole body energy expenditure and alertness in
an office set up.
Secondary outcome
Experiment 1:
The secondary objective of the first experiment is to study the effects of
lighting intensity (experiment 1a) and colour temperature (experiment 1b) on
visual comfort, thermo physiology (skin- and core temperature and blood
perfusion) and cardiovascular parameters under different thermal conditions.
Experiment 2:
The secondary objective of the second experiment is to study whether the
effects of dynamic LED lighting on visual comfort, thermo physiology (skin- and
core temperature and blood perfusion) and cardiovascular parameters, are also
applicable in a laboratory controlled office setting. Because the effects of
LED lighting in office setting may depend on the time of the day the effect of
light intensity will separately be tested under more standardized conditions
during the morning and evening.
Background summary
The built environment consumes much energy for heating and cooling of buildings
to maintain indoor temperatures within the narrow limits prescribed by
standards. However, thermal comfort and thermo-physiology are not only
influenced by ambient temperature, also by many individual factors such as
(thermal) behaviour, psychological and physiological characteristics of a
building occupant. The colour and intensity of light may also play a role in
this respect and could have the potential to improve thermal comfort and
alertness of building occupants using different illuminance levels and the
spectral tuning of light. Additionally this may result in a reduction of the
energy consumption of buildings.
Study objective
The objective of the proposed experiments is to study the effect of lighting
intensity and spectral composition (correlated colour temperature) on thermal
comfort and thermo physiology. The obtained insights can be used to improve
thermal comfort, thermo physiology and alertness of building occupants by means
of dynamic lighting systems that consume little energy and have a broad range
of possible intensities and spectral compositions.
Study design
All experiments of this study are carried out in the "*Metabolic Research Unit
Maastricht* (MRUM) of the department Humane Biologie, Maastricht University.
The first experiment (1a) consists of two sessions. In one of the
sessions,measurements will be carried out under dim light (5lux) and mild warm,
mild cold and thermo neutral temperature. During the other session the same
protocol will be carried out, however this time under bright light (1200lux).
The next experiment (1b) is the same as 1a, only this time the measurements are
performed under a low colour temperature (2700K) compared to a high colour
temperature (6500K) of light.
During the second experiment, the results of experiment 1 will be tested in an
artificial office environment. The effect of light will be tested in the
morning and in the evening. The first part (experiment 2a) consists of 3
sessions in the morning. The experiments will be done in a warm environment
under different light conditions: baseline (50 lux en 2000K), light condition A
(750 lux en 6500K) and light conditionB (50 lux en 6500K). The results of the
first experiment are used to design these lighting conditions. During the
experiments physiological measurements and productivity tasks will be done. In
experiment 2b, the physiological effect of light intensity in the morning (1
session) and evening (3 sessions) will be tested. This experiment will be
performed under more standardised conditions (compared to 2a) because skin
blood flow is the primary outcome.
During each experiment the different sessions are randomised.
Intervention
Experiment 1a:
Exposure to a low light intensity (5 lux) and a high lighting intensity (1200
lux), under mild cold, neutral and mild warm temperatures.
Experiment 1b:
Exposure to a low colour temperature (2700K) and a high colour temperature
(6500K), under mild cold, neutral and mild warm temperatures.
Experiment 2a:
Exposure to a warm temperature (around 29*C) and different lighting conditions.
Light may vary in colour temperature (2000K-6500K) and intensity (5lux - 750
lux).
Experiment 2b:
Exposure to a neutral temperature (around 29*C) and different lighting
conditions. Light may vary in intensity (5lux - 1300 lux).
Study burden and risks
The radiation dose for the DXA-scan is comparable to the radiation with an
X-ray in the dental clinic. Illuminance levels will be kept within normal
range. No ocular safety issues are foreseen. Further than possible discomfort
due to exposure to a mild cold and mild warm environment, no significant burden
or risk for the subjects is expected.
Universiteitssingel 50
Maastricht 6229 ER
NL
Universiteitssingel 50
Maastricht 6229 ER
NL
Listed location countries
Age
Inclusion criteria
• Caucasian volunteers
• Generally healthy
• Age: 18 to 30 years
• BMI: 18-25 kg/m2
• Using Microgynon 30 or levonorgestrel/ehinylestradiol
• Normal chronotype
Exclusion criteria
• Colour blindness
• Ocular pathologies
• Medication use
• Pregnancy
• Hypertension (systolic/diastolic blood pressure >140/90)
• Hypotension (systolic/diastolic blood pressure <90/60)
• General feeling of illness at day of experiment
• (History of) cardiovascular diseases
• Contraindications of the telemetric pill:
o In the presence of any known or suspected obstructive disease of the gastrointestinal tract, including but not limited to diverticulitis and inflammatory bowel disease
o A history of disorders or impairment of the gag reflex
o Previous gastrointestinal surgery
o Hypo motility disorders of the gastrointestinal tract including but not limited to Illeus
• Participants that do not want to be informed about accidental medical findings, which might occur during the study. If participants do not agree that they will be informed about unexpected medical findings, they cannot participate in the study.
• Employees of the research group *Thermu* are excluded from participation.
Design
Recruitment
Followed up by the following (possibly more current) registration
No registrations found.
Other (possibly less up-to-date) registrations in this register
In other registers
| Register | ID |
|---|---|
| CCMO | NL49108.068.14 |
| OMON | NL-OMON25849 |