There isn't one. I have a lamp that's got the bulb a foot from the table, and another one that's got the bulb two feet from the table. And if you go to the home store, you'll find even more distances between the bulb and the table.
Most of the time a fixture will be flush or as close to the ceiling as possible in a 8' ceiling.
The time taken for an electrician to install a light fixture can vary depending on the complexity of the installation. On average, it may take anywhere from 30 minutes to 2 hours for a standard light fixture installation.
A general guideline is to choose a light fixture that is roughly 1/3 the width of the pedestal sink for balanced proportion. However, it's also important to consider the size of the room and the distance of the fixture from the mirror for proper lighting distribution.
The light is wired the same as any voltage fixture. Bring the source voltage to the fixture and connect it to the two fixture wires. If you want to control the off-on of the fixture take the source voltage to a switch first and then out of the switch to the light fixture.
If the question is, can I wire a switch to an existing light fixture (and I must assume that it's something like a pull-chain light fixture), the answer is yes.If the question is, "how do I wire a switch to an existing light fixture that has no external switch", the answer is, "in series".The attached web site gives simple instructions on how to wire a basic light switch to an existing light.See sources and related links below
30 inches
Take the nut off at the bottom of the light fixture by unscrewing it.
Most of the time a fixture will be flush or as close to the ceiling as possible in a 8' ceiling.
The light fixture in the living room requires a standard E26 socket.
The standard light fixture wiring colors used for electrical connections are black (hot), white (neutral), and green or bare copper (ground).
It is usually on the bottom of the traffic light.
When choosing a light fixture for your room, consider the size of the room. For a standard 12x12 foot room, a light fixture around 24 inches in diameter is recommended. Larger rooms may require a bigger fixture, while smaller rooms may need a smaller one.
In North America, it's on the bottom.
The standard light fixture wire colors are black, white, and green or bare copper. The black wire is the hot wire, the white wire is the neutral wire, and the green or bare copper wire is the ground wire.
The time taken for an electrician to install a light fixture can vary depending on the complexity of the installation. On average, it may take anywhere from 30 minutes to 2 hours for a standard light fixture installation.
The basic light switch wiring diagram for a standard household electrical setup involves connecting the hot wire from the power source to one terminal of the switch, and then connecting the hot wire from the light fixture to the other terminal of the switch. The neutral wires from both the power source and the light fixture are connected together. This setup allows the switch to control the flow of electricity to the light fixture.
Standard rule, top to the fixture same height as top to the door.