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Making daylight
Artificial daylight replicates the natural effects of sunlight
using a man-made light source—it looks and feels like
the real thing. Natural sunlight contains colours across the
entire visible spectrum. It tends to be much whiter than conventional
artificial light, the composition of which may be missing certain
wavelengths or contain too much red, green or blue light. Matching
the chromaticity, or colourfulness, of sunlight is the starting
point for any artificial daylight system.
The technologies that contribute
to Virtual Daylight®
Light is radiated energy, and harnessing and controlling the
frequency and intensity of this energy to create a natural light
involves a number of technologies. How these technologies are
used will affect the properties of the artificial light.
Colour temperature
Colour temperature refers to the appearance of a light source.
As colour temperature varies, so does the relative power of
the constituent wavelengths. Power distribution across the spectrum
moves towards blue at hotter temperatures—the sun is 5800K
on the surface. Daylight lamps have a high colour temperature,
in excess of 6000K (correlated colour temperature) and a minimum
Colour Rendering Index (CRI) of 80. CRI rates lamps on a scale
of 0 to 100, where daylight is 100. Clearvision offers products
with colour temperatures ranging from 5300K to 7000K.
Steady state
Clearvision’s steady-state lighting uses high-frequency
gear to remove the flicker and hum associated with the magnetic
ballasts that control the lamps.
Polarisation
The polarising lens is an important feature of Clearvision’s
range of luminaires. It removes the glare from the high-brightness
light source and delivers additional benefits too, such as improved
visual acuity and brighter walls and ceilings. Most significantly,
because natural sunlight is partially polarised by the earth’s
atmosphere, the polarising lens recreates this effect to achieve
a more natural-looking light.
Diffusion
Diffusion ensures that rather than seeing a bright point of
light, such as the lamp itself, light is distributed evenly
across an entire surface. This is, of course, similar to the
effect that the atmosphere and cloud has on sunlight. Clearvision
provides diffusion options and also spreader lenses, which can
be used to further disguise the light source.
Colour and intensity
We can change the colour and intensity of artificial daylight
to suit almost any conditions. The appropriate balance can be
selected according to ergonomic, aesthetic, or atmospheric criteria.
Changes can happen automatically using dynamic-control equipment
that monitors and responds to external lighting conditions or
operates according to pre-programmed information.
Concept technology
Lighting technology continues to advance and Clearvision is
evolving its product range and technology to give customers
more choice. Here’s a snapshot of things we are working
on:
Lenses
As light sources become more efficient and powerful, there is
greater potential for glare. Lenses are, therefore, essential
in modern-day lighting products to control distribution, shield
the source, improve quality and make the fitting more attractive.
Clearvision already manufactures polarising and spreader lenses,
and is developing new lens types to enhance the range.
Juice
Juice is the award-winning multi-luminaire ballast technology
from Juice Technology Ltd that eliminates the need for a ballast
in each discharge luminaire. Clearvision has developed a new
range of luminaires that incorporate Juice to reduce power consumption
and maintenance costs over the life of the system.
Control
The trend is for lighting that is more flexible and responsive,
and this implies control. At Clearvision, we push the technology
to create controlled-lighting solutions that adapt to changing
conditions or behave in accordance with pre-programmed instructions.
In addition, we offer consulting services to bring clarity to
performance and protocol requirements, ensuring that customers’
expectations are met.
Ergonomics
It is now widely accepted that ergonomic lighting reduces fatigue
and discomfort, and maximises productivity. To achieve its full
potential, however, lighting must be considered early in the
planning phase of a project. Clearvision continues to develop
its expertise in both ergonomics and lighting and provides advice
and consultancy as part of its project-support and project-management
services.
Total cost of ownership
The capital investment in lighting equipment is not the whole
story.
Power consumption, maintenance and replacement luminaires make
up the greater portion of the total cost of ownership. We are
incorporating new ballast technology and long-life luminaires
into the Clearvision range to increase our ability to meet budget
pressures and ensure that our products look great and last a
long time. |
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