light for the athletes,
The TV audience was top of mind for the
Wimbledon project. Robert Deatker, AELTC
estate director, said, “The purpose of the
project was to improve the quality of lighting for broadcasters, whilst simultaneously
improving the functionality of the lighting
as part of the roof operation.” In terms of
functionality with regard to the roof, the fact
that LEDs can be turned on and off instantly
was a key factor. “Specifically, this involves
reducing the amount of time required by the
lights to warm up or cool down, thus making it quicker to resume play,” said Deatker.
Musco has had prior experience lighting a
major tennis venue, having delivered an LED
project at New York’s Arthur Ashe Stadium —
home of the US Open — prior to that tournament in 2016. Still, Musco created a mockup
of the Wimbledon visual setting at its US
manufacturing facility to test different CCT
and CRI combinations to achieve the optimal combination of direct and indirect light.
Indeed, a UK-based TV crew worked with the
Musco team to evaluate the possibilities.
Of course, player vision was also critical to the project. And Musco completed
further testing onsite at Wimbledon with
input from professional tennis players
brought in for the tests.
Ultimately, the project went for ward based
on luminaires from Musco’s TLC for LED system that was announced in December 2016.
TLC refers to Total Lighting Control and the
ability to direct light precisely to where it’s
intended and to eliminate light spill. The
luminaires have somewhat of a rectangular shape with a recessed array of LEDs in a
housing. The LEDs individually deliver a precise beam and the housing further serves to
control the pattern. The TLC for LED family
includes products that can be used for sports
venues from recreational to professional.
The Wimbledon LED lighting installation
uses rather cool 5700K CCT luminaires. The
90 CRI enables colors to pop and of course
makes the ball easier to track. Depending on camera position, the vertical illuminance is 1300–1700 lx and horizontal
illuminance is 3000 lx.
Jeff Rogers, president of Musco World,
acknowledged the pressure of pleasing the
AELTC team and the players who expect
top performance from the LED lighting.
Biomass from page 7 In crops such as
leafy greens and herbs, the latest movement
is to vertical farms where racks of plants
are stacked and the LED lighting is placed
near the plant canopy.
For applications such as legal medicinal
or recreational cannabis, most of the LED
lighting manufacturers targeting such
growers have mimicked the form factor of
the high-intensity discharge (HID) lamps
used in such applications. Round horticultural lighting fixtures have been mounted
well above the plants with a single fixture
providing the needed energy to a small
group of plants. The physical layout of such
growing operations has been dictated by
the effective beam spread of the lamps and
the fact that heat generated by the lamps
prevents location near the plant canopy.
In vertical farms, LED-based lighting
doesn’t deliver problematic heat, which
allows the dense stacking of layers, and
crops such as lettuce or herbs are stacked
very closely. In the grow operations envisioned by Smart Grow Systems, the growers will use a hybrid of the two. The operations will require more space than herbs or
leafy greens like lettuce. But Smart Grow
Systems believes that cannabis, hops,
orchids, berries, and more can be effectively grown in layers with, say, 3 ft of spacing, or as little as 28 in., between the layers.
So Smart Grow Systems announced the
2×4-ft Goldeni systems, making direct
comparisons to HID sources such as metal
halide (MH) and high-pressure sodium
(HPS) grow lights. Indeed, the Goldeni
system does not include the monochromatic red and blue LEDs typically found
in luminaires for vertical farms but rather
includes LEDs that deliver energy across
the PAR (photosynthetically active radiation) spectrum just as HID sources do. And
some growers seeking biomass have made
the point that red and blue alone will not
optimize yield in fruiting plants.
The company has developed different
versions of the product for various production stages. Goldeni luminaires produce what is called a Baby Blue Spectrum
that is intended for cloning and propagation. The standard Goldenix fixture has
what the company calls the Golden Glow
Spectrum that in the case of cannabis produces what the company says are “resin-rich
crops with exceptional terpenes and trichomes.” Both product types generate what
appears to be white light.
Of course, there is more that can be done
with LED-based lighting. We are planning
our Horticultural Lighting Conference for
the fall of 2017 ( http://bit.ly/2b2sxOX). And
you can find a collection of horticultural
information on our microsite (ledsmaga
Court from page 7