Walking along the track of the old platform, one of the original lighting units (minus the glass) is still visible mounted on a concrete post.

The most notable change was the introduction of the grille and larger, wraparound lighting units.

Under the Energy Policy Act of 1992 old lighting units are being replaced or upgraded with more efficient types.

The lighting units are then arranged 34 high by 30 wide to create the screen that has a 16:9 aspect ratio, sometimes known as letterbox.

First, turn off the power to the lighting units.

One example is using grow labs, or indoor lighting units, to start plants inside the classroom.

The security officers grabbed one of the lighting units on the floor at the mouth of the cave and started inside.

A few large lighting units illuminated most of the cavern, while other, smaller portable units played on the walls.

"Turn on the lights," the Klingon shouted as they found and hit the switch for the lighting unit beside him.

She nodded, turned off the lighting unit, and crawled out the hatch right into disaster.