Deako’s smart lighting system could be in 10 percent of the new homes built in Seattle next year.

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Seattle smart-home company Deako has raised $3.5 million as it prepares to test its smart lighting systems in homes around Seattle.

The company has raised $6.8 million in total funding, including $1.8 million this past April. Deako creates easy-to-install light switches that can be controlled by touch and by the resident’s smartphone.

Deako’s hook is its price: rather than rewiring the whole house, its smart light switches can be installed along with existing systems, making them cheaper than many whole-house systems.

Founder and CEO Derek Richardson said the company will begin beta testing in September, but its main debut will come next year. Deako has signed contracts with builders to be implemented in about 10 percent of all new homes built in Seattle next year.

Any of the touch-screen light switches can be used to turn on a pre-set “scene” in the house — for example, a group of lighting actions might dim a room or turn on lights in only one part of the home.

Deako did not disclose the names of the venture capital firms that invested in the round.