How Bright Are Low Voltage Lights?

As low-energy light bulbs increase in popularity, they become less expensive and more efficient.

Compact florescent lights (CFLs) and light emitting diodes (LEDs) are the two most popular low-energy light bulbs. Switching to low-energy light bulbs reduces energy consumption, however, the brightness of these low-energy alternatives may be a concern.

Measuring Brightness

The most common way to measure the brightness of a light bulb is in lumen. A lumen reading appears on the packaging of most light bulbs.

Brightness

Incandescent light bulbs are 17.5 lumen per watt. CFLs average 50 to 75 lumen per watt. LEDs are usually 100 to 130 lumen per watt. A standard 100-watt bulb is 1,750 lumen. CFLs and LEDs will be as bright if their lumen readings are the same.

Longevity

CFLs and LEDs decrease in brightness overtime. CFLs take a few moments to reach full brightness, may flicker and usually dim faster, especially if they are frequently turned on and off.

Light Quality

These lights work on different wavelengths and have a limited spectrum of light, so the quality of light differs from conventional lighting. Phosphors can be added to mimic natural light. The more expensive bulbs are likely to maintain brightness longer and have a broader spectrum of light.

References

• The LED Light: Lumens, Foot Candles, Candle Power, Measuring Light Output
• Tesco Greener Living: Switch and Save With Energy-Saving Light Bulbs
• Go Low Energy: The Pros and Cons of Low Energy LED Lighting
• Energy 4 You: About Compact Florencent Light Bulbs

Resources

• Lamps2udirect Ltd: Save Money With Low Energy Lamps