I received a request last June 2011 to design a scheme to light up a simple horse stud which will be used for practice and some special nights when the owner has visitors riding with him. Little did I know that the owner of this facility is no other than the first Olympiad who gave Saudi Arabia its first Silver Medal at the Sydney Olympics last 2010 in the equestrian event.
The area of interest consists of one large stud for special events bout 85m x 60m and one smaller stud for practice about 39.41m x 66.69m. The first constraints I have encountered with design is that the client already have bought 4 x 20m poles for the larger and 4 x 10m poles. However there are no design details for the Top frame where the floodlights are to be installed.
Ideally, when you mount Poles on the corners, you are to design a pole height where the aim of the floodlight will still reach the center of the field. In this scenario, the top height of the pole should be 24m. Since the existing pole is under 25m, I offered a Floodlight with Glare hood to control glare & light spill when the floodlights are aimed to the center.
Since the beginning, I confirmed from the client that the lighting scheme is only designed for practice level and not as televised therefore following the IESNA recommendations for such practice, I prepared a floodlighting scheme to meet an average 300 lux with Min/Average uniformity of U0 > 0.5.
Using DIALux floodlight arrangement, I used 3 level of floodlight NEMA which will evenly distribute the light through the field while achieving its lux target. I used NEMA 5×5, 4×4 and 3×3 on each level and mirrored the aim on each pole using DIALux floodlight arrangement while maintaining that my aim will not be less than 20 degrees below the horizontal to control glare and upward light spill.
My other consideration is to avoid long shadows, bright streaks which are common to see in High wattage narrow beam floodlights, and just enough contrast so the light falls evenly on the rider and the horse. Also I suggest to him the option of ordering the 4th level floodlight which will only be ordered during special events which will give the areas an average of 500 lux. The glare is a big concern as too much light when jumping or too dark shadows on the ground might scare the horses and bad falls can be dangerous if not fatal both on rider and horse.
The Idea was approved by the owner and with Mohammad Basouny’s commercial offer, the client bought the package except that he did not go for the 4th level floodlights and the glare hoods. The owner proceeded by ordering a design, install and erect of his existing poles. I made a point to the pole suppliers that they stick with the design I provided in the CAD layout and they did. One exception was that the smaller poles which was not inclined but it still manageable on site.
MORE CHALLENGES AHEAD
The pole was erected and floodlights installed and energized but that was not the end of it. Incompatible lamps were supplied to all floodlight so as soon as they were tested, the floodlights kept on turning on & off. True to its commitment, Saudi Lighting sent its Quality Assurance Team and troubleshot the cause of the problem. They have found out that the 1000W Metal Halide lamp initially supplied is not compatible to the European control gears of the floodlights. QA team made an order to replace the lamps in‐warranty and new compatible 1000W MH lamps which solved the restarting issue.
For two nights together with some technicians, I was sent to do commissioning works and to supervise the aiming of all the floodlights. I trusted my lighting design enough that I told the technician how to follow the lighting design according to its tilt and turn angles. While he was on the top of the frame aiming and turning the floodlights, I was at the ground making sure that each floodlight got its correct aim.
I am well‐pleased with result because my goal of diffusing all shadows, no bright streaks, and evenly distributed light was well achieved. The client thinks that we did a fantastic job!
We were able to finish the commissioning with a satisfied client even ordering additional glare hoods and additional floodlights on top of the existing mounting just in case in the future they will competition in the venue. I left the site leaving the client hopeful that someday his horse stud site will be popular and well‐known for all who pass by on their way to the Janadiriyah Festival venue.