Introduction of lamps and lanterns related parameters (II)

color temperature

The official definition of color temperature is ‘the most black at different temperatures to produce different colors,’ according [Kelvin] said that the single temperature is K, with one color temperature being 1K. We commonly use color temperatures in our daily lives, such as 3000K (warm light), 6500K (white light), and 4000K (neutral color) mixed when light is turned on together.

With increasing spendthrift instincts and diverse application settings, individuals are becoming acquainted with an array of color temperatures, contributing towards a well-rounded lighting atmosphere.

Chart of colour temperature from 1000K to 10000K

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Different colour temperature and colour change

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Here are some examples of common light source colour temperatures:

1700K: Match light

1850K: Candlelight

2800K: common colour temperature of tungsten (incandescent) lamps

3000K: Common colour temperature of halogen and yellow fluorescent lamps

3350K: Studio ‘CP’ Lamps

3400K: Studio desk lamps, photographic floodlights (not strobes), etc…

4100K: Moonlight, light yellow fluorescent lamps

5000K: Daylight

5500K: Average daylight, electronic flash (varies by manufacturer)

5770K: Effective solar temperature

6420K: Xenon arc lamp

6500K: Most common white daylight colour temperature

9300K: TV screen (analogue)

The colour temperatures of six different colours of Philips lamp beads as captured

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According to the characteristics and needs of different industries, professional light distribution staff have been using a set of standard light distribution methods, meat is a warm-coloured series so the use of 2700K incandescent warm red, patisserie using 3000K warm yellow, vegetables and fruits using 4000K neutral colours, jewellery and seafood using 7000K cool white.

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Public space and personal space class:

Residential: 2700K-3000K

Hotel: 2700K-3500K

Office: 3500K

School: 3500K

Hospital: 4000K

Photography: 5500K

Manufacturing: 4000-6000K

Jewellery: 6000-7000K

Application Scene Category:

Facade: 1700K

Bread: 2500K

Fresh meat: 3000K-3200K

Clothing: 3000K-4000K

Fruits and vegetables: 4000K

Table lamp: 4000K

Jewellery: 6000K-7000K

(Gold Jewellery: 3000K, Silver Jewellery: 7000K, Jade: 4000K-5000K)

Aquatic products: 6000K-7000K

Indoor lighting

Choose the right indoor lighting colour temperature according to your décor’s base tone to enhance your interior aesthetics significantly. The appropriate lighting color temperature is crucial as it enhances the lighting quality, considering surfaces such as walls, floors, furniture, decorations, and room usage. Additionally, bear in mind the potential harm caused by the blue light emitted by the light source. For instance, older folks and kids might prefer low color temperature lighting. Different colour temperatures affect our moods – warm tones induce relaxation, while cool ones promote clarity. People suffering from autism or depression shouldn’t stay in environments with a color temperature over 4000K for extended periods. Long-term exposure to a color temperature higher than 6500K may lead to retinal macular degeneration. Therefore, it’s important to take careful consideration when choosing the light source color temperature.

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Keep in mind that high color temperature lights emit more blue light. Blue light energy increases drastically beyond 3000K, which is particularly harmful to the retina. Therefore, try to avoid using high color temperature lights at home, where we seek comfort after a hard day’s work.

Light with a warm color temperature under 3300K resembles incandescent light and candles (at around 2000K). It radiates warmth, promoting a cozy, healthy, and relaxed atmosphere. Ideal for homes, family spaces, dorms, hotels, and colder areas. Adjusting the light source to a warmer tone before bedtime helps maintain melatonin production.

The neutral color range lies between 3300K and 5000K, offering a soothing, comfortable, and tranquil ambiance. Perfect for shops, hospitals, offices, hotels, restaurants, waiting rooms, etc.

Above 5000K, the light source closely mimics natural light, creating a bright, focused feel. Ideal for offices, meeting rooms, classrooms, drawing rooms, design studios, libraries’ reading rooms, display windows, etc. However, using this type of lighting during bedtime can disrupt sleep patterns and increase illness risk, which is why white LED street lights are unpopular.

The higher the color temperature, the stronger the harmful blue light energy becomes. Desk lamps, which are close-proximity and long-lasting eye lighting devices used primarily by teenagers, warrant the use of low-color temperature lighting for their health.图片6

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