Lighting for Reading
If you have low vision, improving the lighting in your home is the key to making everyday tasks easier, and reading is no exception. It’s important to find the proper lighting to help you read most effectively, even with the best magnification. Keep in mind that depending on your eye condition, lighting can also cause glare; therefore, it can be helpful to work with a low-vision specialist to learn what types of lighting work best for you. In most cases, it’s best to use direct lighting that can be adjusted to focus the light directly on your reading material.
The Different Types of Light
There are several different types of light, each with its characteristics. When you go to the store to purchase a new light bulb, it’s helpful to pay attention to three terms that you can find on every light bulb box:
- Lumens: the amount of light that a light bulb produces. The higher the lumen number, the more light the bulb will produce.
- Wattage: the amount of electricity a light bulb uses. The higher the wattage number, the more electricity the bulb will use.
- Kelvin or K rating: a measure of “color temperature.” A Kelvin or K rating of 2,700 produces a warm, or yellowish, light; a K rating of 4,500 produces a white light closest to actual daylight; and a K rating of 5,000 or above has a cool or “bluish” light.
- For most people with low vision, a Kelvin rating of under 5,000 is usually recommended. This is partly because there will not be any blue light or ultraviolet if a lamp is under 5,000 K. Also, the lamp will probably be better contrast if it is under 5,000 K.
- The most important terms for people with low vision are lumens and Kelvin rating.
Although natural sunlight is ideal for most everyday tasks, it can also present problems. Sunlight is inconsistent throughout the day, and it can create glare spots and potentially dangerous shadowy areas in your home.
Incandescent Light (Basic Light Bulbs)
Incandescent light emphasizes the red/yellow end of the visible light spectrum, which is closer to natural sunlight. The light from an incandescent light bulb is also very concentrated. That makes it best for “spot” illumination on close work, such as reading, sewing, and crafts. It is not recommended for overall room lighting since, like sunlight, it creates glare spots and shadowy areas.
Please note: At the end of 2014, the United States phased out production of all incandescent bulbs. Until supplies run out, these bulbs will remain on store shelves alongside the energy-saving alternatives replacing them.
Fluorescent Light and Compact Fluorescent Lamps (CFLs)
Fluorescent light and CFLs produce less heat, use less energy, and are more cost-effective than incandescent bulbs. Fluorescents are usually recommended for overall room lighting because they don’t create glare spots and shadows. A CFL is a compact version of a fluorescent tube that is curved or folded to fit into the space of a standard bulb. Look for CFLs with a K rating of around 4,200 but under 5,000.
CFLs have some drawbacks, however:
- CFLs take time to warm up and achieve full brightness.
- Some models can’t be used with a dimmer switch.
- Because they contain a small amount of mercury, CFLs must be recycled at a hazardous materials facility. Also, it’s difficult to avoid mercury contamination when cleaning up broken CFLs.
Light-Emitting Diodes (LEDs)
LED bulbs produce minimal heat, are very energy-efficient, and achieve full brightness instantaneously. The energy-producing part of the light, the diode, is encased in a hard plastic cover that looks like a standard bulb and will not break easily. LED bulbs do not contain mercury, have a life expectancy of 50,000 hours, and work best for concentrated lighting on close work in a flexible-arm lamp with a shade that directs the light downward. They are not recommended for overall room lighting. Look for LEDs with a K rating of around 4,200 but under 5,000.
Some people prefer halogen light because it is brighter, “whiter,” and very concentrated. It is used in lamps, track lighting, and ceiling fixtures and is also available in adjustable gooseneck and flex-arm lamps.
There are some disadvantages to halogen light, however:
- Since it is hotter and more focused than other types of light, it is not recommended for prolonged close work.
- When used in a reading lamp, the bulb must be shielded by a piece of protective Plexiglas or durable plastic.
- It produces intense heat and can cause fire and severe burns if misused. Always follow the manufacturer’s safety precautions when using halogen lighting fixtures.
This type of lighting combines CFL, LED, and fluorescent light. For example, some lamps combine CFL, LED, and fluorescent lighting in the same fixture. Some adjustable flex-arm lamps contain a fluorescent “ring” (a Circline bulb) surrounding a CFL or LED light. Combination lighting is usually the most comfortable light for everyday activities because it provides a fuller-spectrum light that more closely resembles natural sunlight.
More Lighting Information
For more information about helpful lighting for reading, you can view Positioning a Light Source and Minimizing Glare in the VisionAware Better Lighting for Better Sight video series.
Resources for Lighting
- Helpful Products and Technology
- See Lighting and Glare for additional lighting information.
By Maureen A. Duffy, M.S., CVRT