In an average-sized bedroom, your lights should be positioned three to five feet apart. In most cases, four to eight lights are sufficient for usage in the bedroom. Lights should be placed around the room's perimeter. In a large room, you'll most likely require an extra row. Such rooms need nine or more lights to provide even illumination.
The number of bulbs required depends on the type of light you choose. Incandescent lamps are usually used in pairs. If they're replaced with energy-efficient compact florescent lamps (CFLs), you could save nearly 50 percent on your lighting bill. However, it is recommended that you don't use CFLs as bedside lamps because they contain mercury. Instead, use LED lampshades.
Generally, people agree that at least one light should be left on during the night so that anyone can come in and not worry about turning on other lights. However, this isn't always possible due to limitations such as building codes and personal preference.
A decent general rule of thumb for positioning is to split the ceiling height by two. As a consequence, the amount of space to leave between each light is determined. For an 8-foot-high ceiling, for example, recessed lighting spacing would be 4 feet between each light. This will provide for adequate space for typical room illumination. If your room has a low ceiling, add lights.
The number of lights required depends on how much light you need in a given area and the type of light you choose. For example, if you need more general lighting than task lighting and you choose fluorescent lamps, three of them should be sufficient. If you want more focused light such as from a high-output spotlight, four or more are needed.
The amount of light required varies depending on the time of day and the activity going on in the room. During the day, less light is needed because people can see where they're going. At night, when you don't want to turn off all the lights, even small rooms feel dark when only one lamp is turned on. Add more lamps as needed.
There are several factors that determine how many lights you need for your space. The first thing to understand is that the amount of light required increases as the square of the distance that it needs to travel. This means that if you double the distance between two lights, the total light output needed goes up by a factor of four.
There will also be grow chambers that require even more light. For example, an 8' by 8' grow room would most likely require 4 grow lights, however a 10' × 20' space may require up to 8 lights. The more plants you have growing at one time, the more lights you will need.
A good rule of thumb is if you can see your hand in front of your face, then it's too dark in there! You want to make sure that every plant has enough light to thrive and produce flowers or fruits.
Light bulbs emit different wavelengths of light. These wavelengths are called "spectrums." Plants use these spectrums to help them grow and develop properly. The higher up on the spectrum that light is found, the more ultraviolet (UV) light is emitted. UV light is harmful to plants so keep all those lights away from your grow chamber! All plants prefer the full spectrum of light, but some types of plants are more sensitive to certain colors of light than others. For example, tomatoes like to absorb red light while zinnias prefer green light. There are also glow-in-the-dark plants such as impatiens that love blue light.
The amount of light that reaches your plants depends on how high you set your lights.
One fixture every 8 to 10 feet should enough, however depending on the lumen output and size of the room and lights, you may want somewhat more or less spacing. Other factors such as how much lighting you use elsewhere in the house, what kind of light (fluorescent vs. incandescent), whether or not you want to integrate your lighting into the room's decor, etc. are all considered when determining how many fixtures are needed.
It is important to consider the direction(s) that walls and ceilings are oriented in relation to one another when choosing where to place lights. If you intend for all the lights to be on at once, placing them near the ceiling will provide even illumination of the room; if you only want some parts of the room to light up, you can limit the flow of electricity by using lower-power bulbs in those areas. Otherwise, you'll end up with bright lights where there used to be dim ones, or no lights at all.
The easiest way to figure out how many lights you need is to take the area of the room and divide it by the average distance between lights. For example, if your room is 100 square feet and you want eight foot spans between lights, you would need 20 lights. But if you want the lights about six inches from the wall instead, then you would need only 12 lights.