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230 V Lighting Design Guide

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Appendix B: General Lighting Design Considerations

Crestron provides many options for illumination control. The following general lighting design information can help

formulate a complete, energy efﬁcient lighting design plan.

Light plays an essential role in the ability to perceive the world, playing a critical role in how space is perceived.

Lighting can affect performance, mood, morale, safety, security, and decisions.

The ﬁrst step in producing the right lighting design is to deﬁne the use of the space. The lighting designer can then

determine quantity of light, color quality, brightness, direction, and placement.

There are two aspects to lighting design that go hand in hand, the qualitative or aesthetic aspect and the

quantitative or engineering aspect. The qualitative aspect has to do with ensuring that the space has a pleasing feel

and ambiance, the artistic interspersing of light and shadow, illumination and darkness, ﬁgure and form.

The quantitative aspect ensures adequate light for the task at hand. The Illuminating Engineering Society publishes

guidelines of light levels based on the nature of the task, activities performed in the space, the size of objects

handled, the detail required, the average age of the people in that space and so on. For example, a typical ofﬁce is

lit to an illumination of 30 to 100 footcandles. Light levels can also be expressed in the metric unit lux; 1 footcandle

is approximately 10 lux.

The rate of energy consumption is called power and is measured in watts. A 200 watt lamp is consuming energy

at twice the rate of a 100 watt lamp. The electric company charges consumers for the total amount of energy they

consume. This is measured in kilowatt-hours or kwh. A 200 watt lamp burning for 5 hours consumes 1,000 watts

hours of energy, which is called a kilowatt-hour. Note that burning a thousand watt lamp for one hour costs the

same as burning a hundred watt lamp for ten hours.

In some rooms, one lighting ﬁxture or a group of ﬁxtures provides all the illumination. These rooms include

closets, storage rooms, utility rooms, and garages. In these areas, the functionality of the ﬁxtures outweighs style

consideration. The greatest energy efﬁciency is achieved with compact ﬂuorescent downlights. The best performing

systems use a 32 watt triple tube downlight, providing more light than a 100 watt incandescent lamp while

consuming 1/3 the amount of energy.

For many spaces, such as garages and closets, a simple lighting solution is the most appropriate. In storage rooms,

basements, and other places, only basic lighting is needed. These are excellent opportunities for energy efﬁcient

lighting ﬁxtures, especially if lights are left on for extended periods of time.

Task Lighting for Speciﬁc Work Areas

Task lights minimize reliance on overhead lighting and provide directed lighting for countertop work in kitchens,

workshop, ofﬁce, etc. Energy efﬁcient CFL recessed lights or reﬂectorized CFLs are recommended for this

application. Recessed downlights are located over task locations, especially in the kitchen, bath, shower, or at a

desk. One recessed light may be all that is needed in a shower stall or tub, but in a kitchen, a group of downlights

often provides more ﬂexible task lighting. It is best to locate downlights directly over a task, but in the kitchen keep

in mind that the downlight must also illuminate into the base cabinets, making ﬁxture locations over the center of

the room equally important.

Under-cabinet lights are used whenever there is an overhead cabinet above a counter, such as in a kitchen, laundry

room, or home ofﬁce. Fluorescent under-cabinet lights produce signiﬁcantly more light than incandescent strips

and use much less energy.

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Crestron Lighting Design Guia de Instalação Página 70