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Any experienced designer will tell you that lighting is an essential ingredient when you’re decorating a room — not the afterthought that many of us consider it.

If you’re tempted to spend more of your time picking out furnishings or puzzling over layouts, remember that LED lighting can completely transform a space — not just by brightening dark corners, but by affecting your emotions.

“Light is a powerful thing,” said Theo Richardson, the director of development at Rich Brilliant Willing, the Brooklyn-based design studio known for its striking LED fixtures, which he founded with Charles Brill and Alexander Williams. “The right light lifts the mood, inspires productivity and motivates us. At home, light enlivens the little things — our morning routines, or the moments we spend with friends.”

Depending on a room’s layout, he said, accent lights could be used to highlight art, and table lamps could be placed beside seating to add another layer of light. And for extra ambience, he added, “a candle never hurt.”

The goal, he explained, is to create contrast between the light at the center of the room and around the perimeter, and the darker spaces in between: “Without the darker, quieter moments, everything is flat and boring. It’s the subtle interplay between light and dark that creates appeal.”

One place where bright light is more important than ambience is the kitchen.

Mr. Orsman suggested flooding the space by installing high-hats or recessed lights along the edge of the ceiling. If you have a kitchen island, consider hanging pendants overhead, he said, which will light the space without taking up room you might need to eat or prepare food. Also, you’ll be able “to see your guests without having to look around a hanging light.”

And don’t forget under-cabinet light: Running LED light strips on the bottom of your upper cabinets is the easiest way to create an evenly lighted counter space for food prep and cooking.

If you have a north-facing room without direct sunlight, it will generally require a little more thought.

Donna Mondi, an interior designer in Chicago, installed recessed fixtures along the perimeter of a north-facing living room to complement a central pendant that spread light horizontally throughout the space. But she didn’t stop there: She also used table lamps to illuminate dark corners and a pair of sconces to draw attention to a special piece of art.

For a dark bedroom, she used a similar strategy, combining a central chandelier with discrete up-lights in the corners of the room, bedside lamps for reading and a pair of sconces over the fireplace opposite the bed.

“The worst option is a recessed fixture over the sink, as it casts shadows that are not flattering,” Ms. Mondi said. Instead, she suggested, opt for wall-mounted sconces with 75-watt bulbs installed about 66 inches off the floor, which will help cast even illumination across your face.