How smart lighting reduces wasted energy

Most of the saving in a modern lighting system already happened before the controls went in. The LED did it. Moving a house off incandescent and halogen is the large, one-time step, and no control system repeats it. What control adds sits on top of that, and it is narrower than the marketing around it suggests.

What it adds is the removal of waste the bulb cannot do anything about: light burning in rooms nobody is in, at levels nobody asked for, at hours nobody needs. We are not going to put a percentage on that. Anyone who does without metering your house first is guessing in public.

The waste is behavioral, not technical

Walk a house at nine at night and the pattern repeats. A pantry light on since morning. Two closets. The basement stair. Every can in the kitchen at full output, because the switch has one position and that position is on.

None of that is a fault. It is what a wall switch asks of people, which is to remember. A lighting system takes the remembering out of it. That is the whole mechanism, and everything below is a version of it.

Off when nobody is there

Occupancy sensing brings a room up when somebody walks in and lets it back down once the room empties. It earns its keep in the spaces people pass through rather than settle in: hallways, closets, pantries, laundry rooms, garages, mudrooms.

Placement is what decides whether it works. A sensor aimed at the doorway instead of the room reads a person sitting still as an empty room. A closet sensor with a long timeout is just a light that stays on with extra steps. This is why the sensor layout gets drawn before anything is ordered, and adjusted again once people are living in the house.

Dimmed by default

A dimmed fixture draws less than the same fixture at full output. That much is physics, and it holds whether or not anybody in the room notices.

What makes it stick is that the level is decided once, in the programming, room by room and hour by hour. The kitchen does not come up at full at ten at night unless somebody asks it to. Nobody has to choose the lower setting, because it is the setting the room already starts from. Defaults do the work that willpower was doing before.

Aware of the daylight

Daylight harvesting is a sensor reading the light already in the room and trimming the fixtures to hold a steady level. In a west-facing room on a bright afternoon, the electric lighting can come down a long way before anybody perceives a change.

Shades do the other half, and theirs is thermal work rather than lighting work. Closing them against afternoon sun keeps heat out of a room the air conditioning would otherwise have to pull back out. Opening them on a cold, bright morning does the reverse. Lighting and shades on one platform is what lets those two behaviors agree with each other instead of fighting.

Scheduled by the sun, not the clock

Astronomic scheduling ties exterior lighting and the timed interior scenes to sunrise and sunset at your address rather than to a fixed hour. The times drift through the year on their own, without anybody resetting anything.

A clock-based timer set in June is wrong by an hour or more by December, and the way it is wrong is lights running in daylight. That is the least interesting kind of waste, and it is the easiest to stop.

What it does not do

It does not make the house darker. Levels are chosen per room and per time of day, which is the opposite of turning everything down.

It does not recover anything in a room whose lights were already off. A household that is disciplined with switches has less to gain here than one that is not, which is another reason we will not hand you a number.

And it does not stand in for insulation, windows, or right-sized mechanical equipment. Lighting is a modest share of what a house consumes. What control does is take the avoidable part of that share off the table quietly, without anybody having to think about it. IntegrateIT is a Lutron Certified Installer, and this is the part of the pitch we would rather understate than oversell.