London School of Hygiene and Tropical Medicine
Commissioned by Devereux Architects, Hoare Lea Lighting employed theatrical techniques within the lighting solution for a new building for the London School of Hygiene and Tropical Medicine. Creating office space, teaching rooms, meeting rooms and a breakout area, the building sits within an existing courtyard surrounding the college, and is connected to the old buildings via a glass facade and ceiling that create an atrium space between the two.
To light the four link bridges, 3m runs of tricolour LEDs were added on both sides, fitted to linear-led extrusions with a polycarbonate diffuser supplied by NJO and mounted within a cove. Each of the four bridges was given a different address, allowing the option of colour 'waves' and flexibility in programming.
The system was pre-programmed to display different colours on different days, but it can also be changed manually using a touch panel, choosing from a palette of 16.7 million colours, or by selecting various pre-programmed sequences on special occasions, such as a drinks reception.
The use of feature lighting to the link bridges offers a splash of colour and adds interest that enhances the overall building design. It also provides versatility so that different moods can be created. The success of this exercise is indicated by the fact that the client had to have the touch panel locked because people's artistic differences and tastes were resulting in a constant change of the lighting effect within the space.
Further theatrical lighting techniques have been used in a refurbished corridor linking the old and new buildings. Ten Gecko gobo projectors from DHA Lighting are arranged in two parallel rows of five, stretching the length of the corridor. As students and faculty staff step into the corridor, depending on the direction they are walking, a set of five projectors is triggered in sequence. These project images of mosquitoes on the walkway, in front of the person who triggered them, timed to the walking speed of the average person (meaning it is never in sync with anybody). The idea came from the insect motifs that adorn the outside of the college and provide a link to the school's history and battle with tropical diseases. Other images planned for the future are molecules, formulae and DNA - which will be changed to indicate the work of the various departments.
The Gecko image projector is a coolrunning luminaire and its compact design and adjustable sliding yoke made it ideal for this purpose. Powered by an integral, dimmable 12V transformer, the light source is a 75W MR16. This combines a highly efficient light output with long lamp life to ensure minimum maintenance. Image projection benefits from the use of high-quality, crowned, bi-convex lenses, which give crisp, sharp images.
Controlling the projector are Dynalite's DUS703 presence detectors. These are active from morning till evening, while at night only the discharge sources are left on for security purposes.
Dynalite's DTK600 was specified to control the lighting, including the colourchanging LEDs. The powerful LCD touchscreen incorporates a real-time clock, a sequencer and a minimum of 100 pages of display. In this instance, the DTK600 allows the end user to select three scenes for gallery mode and to ramp up and down the fluorescent lamps, depending on the application.
As well as lighting, the DTK600 can control equipment such as audio-visual, security and heating and ventilation from one location.
Displays such as logos, button configurations, fl oorplans and diagnostic icons can be enabled to perform simple or conditional logic tasks.
Used in combination, Dynalite's DBC410 controls the fluorescent ballasts. This fourchannel controller is suitable for use with electronic dimmable fluorescent ballasts, either 0-10 or DSI. It also includes four heavy-duty 10-amp relay outputs to switch fl uorescent lighting or other loads in a DyNet energy-management system.