Lighting design is never as simple as “installing a bulb.” The performance and performance of each lamp directly impact the ambiance and user experience of a space. There are numerous lamp brands on the market, and manufacturers provide a wide variety of data, some of which are flashy and confusing. This article will help you clarify your thinking and grasp the six core indicators that must be considered when evaluating lamps, helping you scientifically select the right lighting solution for your home.
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1. A Complete Analysis of the Six Core Evaluation Indicators
1. Lumens (lm)
Lumens represent the total amount of visible light emitted by a lamp and are a direct measure of brightness. Note that flood (diffuse) lumens and directional lumens have very different effects: flood lumens provide a softer, more diffused light, while directional lumens are concentrated and more penetrating. For example, a 150lm flood luminance lamp will appear far less bright than a 150lm directional luminance lamp.
Recommendation: Select a precise lumen value based on the function of the space. The required lumen range varies greatly depending on the brightness requirements. For example, small accent lighting can use 150-200 lumens, functional areas generally require 600-800 lumens, and indirect lighting may require over 3000 lumens to compensate for reflection losses.
2. Beam Angle
The beam angle refers to the angle at which the light is focused, which determines the area covered by the light. Generally:
- A 40° beam angle is often too wide, causing strong glare and uneven lighting distribution.
Avoid using directional lights with extremely wide beams, as they can create a cluttered, “ceiling acne” effect. For precise lighting effects, the best way is to test lighting samples in person.
3. Color Rendering Index (CRI)
The color rendering index (CRI) measures a light fixture’s ability to reproduce the colors of realistic objects. A high CRI (above 90) ensures that skin tones, fabrics, and interior decorations appear the most natural. A low CRI can make people appear dull or unhealthy.
Key: CRI is crucial for high-quality lighting, especially in living spaces. Choose lamps with a rating of Ra90+ to ensure that people and objects appear in their optimal light color.
4. Color Temperature (CCT)
Color temperature reflects the warmth or coolness of a light’s color. Measured in Kelvin (K), CCT reflects the color of the light. Common home color temperature ranges are:
- Around 2700K: Warm yellow light creates a welcoming atmosphere.
- Neutral warm white at 3000K: Bright without excessive color cast.
- Cool white at 6000K and above: Suitable for offices or environments requiring high brightness.
Note: For home use, the recommended color temperature should be consistent to avoid mixing warm and cool colors, which can prevent visual fatigue and even create the “alien ship lights” effect.
5. Watts (W)
Watt refers to the amount of electricity a lamp consumes. Traditional light bulbs measure brightness by wattage, but in the LED era, lumens are the correct measure of brightness.
Recommendation: Consider both energy conservation and lighting needs. Avoid excessive use of high-wattage lamps and manage the overall power density in the room to meet energy regulations.
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6. Glare
Glare is an uncomfortable sensation caused by light, often causing squinting and headaches. The glare rating (UGR) provided by manufacturers often varies due to different calculation methods, so actual experience is more important.
Principles:
- Avoid downlights with diffusers to prevent glaring “pimple”-like spots on the ceiling.
- Choose lamps with good shading.
- Measure the lighting effect when the lamp is turned on to ensure a comfortable light experience.
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2. Key Points in Lamp Selection
Understanding these six factors—lumens, beam angle, color rendering index, color temperature, wattage, and glare control—will help you objectively identify quality lamps that are environmentally friendly, energy-saving, and provide excellent light performance. Lighting design isn’t something that can be achieved overnight. Instead, it increasingly emphasizes layering, functionality, and ambiance. Only by properly combining multiple light sources can an ideal home lighting environment be achieved.
For more professional lighting design, we recommend seeking the help of a seasoned lighting designer to overcome common mistakes and create a warm and inviting atmosphere unique to your home.
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“Light is the silent language of space. Only by understanding light can dreams be created.”
—Words from a master of light and shadow art.