Great problem! Could be a lot of things.

The ballast might be overheating and tripping a thermal cutout. If this is the case then you should be able to hear a distinct click from the fixture when it cuts out. It won't restart until it cools down and the cutout resets.

The tubes may be failing. Do you have new tubes or different tubes that you can try? Possibly, new tubes will work for a while and then start doing the same trick, that points to a ballast problem.

1900 lumens? Are these Plant & Aquarium tubes?

Everything is brand new. The lights are GE fluorescent F40 plant and aquarium.
There is no clicking. Now they do not come back on.
What do you do with a ballast problem?
Thanks for answering.
I need help.

Do the lights sort of flicker or look swirling inside after you turn them on? It could be that the bulbs are not situated properly in the fixtures. Try taking them out, putting them back in, and then rotating carefully until the little notch halfway between the pins on the end caps of each bulb is aligned with the openings in the fixture (in other words, the opening is at the halfway point between the pins).

If you're using an extension cord, make sure it's the three-pronged type and is not cracked or worn. Try plugging the fixture directly into a wall socket. If it works then, replace the extension cord.

Also, do you have the fixture on the same circuit as another major appliance? Try plugging it into another outlet somewhere else in the house, and see if that makes a difference.

If none of that works, try borrowing a couple of ordinary fluorescent bulbs from a neighbor (or buy them at the hardware store for a few dollars) and see if the same thing still happens. If so, chances are your fixture is defective and you should exchange it. If not, then the problem is probably in the bulbs.