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Product Information
The Louis Poulsen PH 4½-3½ Glass Table Lamp, a creation of Poul Henningsen, encapsulates the innovative three-shade system designed in the mid-1920s. This lamp, part of a broader family that has grown to 30 lights, including outdoor variations, is a hallmark of Henningsen's dedication to producing glare-free, directed light that enhances any space it inhabits. Initially developed in collaboration with Louis Poulsen, this design philosophy aimed at creating soft shadows and an evenly distributed light, has become a cornerstone of lighting design.
Transitioning from metal to glass shades, the PH 4½-3½ model not only directs light downwards but also adds to the ambient light of a ro...
Dimensions
Ø450 cm x H 550 cm
Base: Ø240 cm
Diameter
45 cm
Height
55 cm
Width
45 cm
Weight
9.3 kg
Cable Length
2.7 m
Material
Shades: Mouth-blown white opal glass.
Anti glare ring: Purple, spun aluminium.
Top plate: High lustre chrome plated, spun brass.
Base: High lustre chrome plated, spun brass.
Stem: High lustre chrome plated, steel.
"IP" stands for "Ingress Protection" and is a standardized way to specify the protection of enclosures around electronic equipment like lighting fixtures. It's like a protection score, with two numbers following the letters "IP." The first number indicates resistance to solid objects (like dust and hands), while the second signifies protection against liquids (like water).
When choosing lighting, especially for environments like bathrooms or outdoors, it's essential to consider the IP rating. This ensures your fixture is suitable for its intended location, providing safety and longevity.
The Kelvin (K) scale is a measure of color temperature of a light source. It represents the perceived warmth or coolness of a "white" light. This perception is analogous to the cycle of natural light, which shifts throughout the day from a warm orange-hued white to a cool bluish-white.
Understanding the Kelvin (K) rating is crucial for creating an optimal lighting environment. The color temperature of light influences visual comfort, task efficiency, and mood. Higher Kelvin values suit focused workspaces, while lower values are best for relaxed settings.
Lumen, often denoted by the symbol "lm," is the unit for measuring the amount of visible light emitted by a source, such as a light bulb. In simpler terms, it quantifies the brightness of a light. It's not about the energy the light bulb uses (that's watts) but rather how bright the light appears to our eyes.
Historically, people used watts to gauge a bulb's brightness, mainly when incandescent bulbs were the norm. However, with the rise of energy-efficient lighting like LEDs, the focus shifted to lumens.
Lumen, often denoted by the symbol "lm," is the unit for measuring the amount of visible light emitted by a source, such as a light bulb. In simpler terms, it quantifies the brightness of a light. It's not about the energy the light bulb uses (that's watts) but rather how bright the light appears to our eyes.
Historically, people used watts to gauge a bulb's brightness, mainly when incandescent bulbs were the norm. However, with the rise of energy-efficient lighting like LEDs, the focus shifted to lumens.
Watt (W) is the unit of power, representing the rate of energy transfer or conversion. In lighting, wattage indicates how much electrical energy a light source or fixture consumes to produce light. So the Wattage value of a light source gives you an idea of its energy consumption.
A higher wattage indicates the light source uses more electricity, and vice versa. Traditionally, a higher wattage also meant a brighter bulb, but modern lighting technology has changed this assumption. Especially with LEDs, you can have low wattage (low energy consumption) but high brightness.
Dimming refers to the capability of a lighting fixture or source to adjust its light intensity, allowing you to lower or increase the brightness according to your preferences. This feature, known as dimming or dimmable lighting, lets you set different moods and atmospheres in your home, making it more comfortable and adaptable for various activities.
Dimming allows you to control the lumens emitted by a light source. Think of lumens as the measure of the brightness of a light source. Dimming is like having a volume control for that light. When you dim a light, you're reducing the lumens, making the light less bright. For instance, if a bulb is normally very bright at 1000 lumens, you can use dimming to make it 500 lumens, creating a gentler and cozier lighting effect.
Dimming refers to the capability of a lighting fixture or source to adjust its light intensity, allowing you to lower or increase the brightness according to your preferences. This feature, known as dimming or dimmable lighting, lets you set different moods and atmospheres in your home, making it more comfortable and adaptable for various activities.
Dimming allows you to control the lumens emitted by a light source. Think of lumens as the measure of the brightness of a light source. Dimming is like having a volume control for that light. When you dim a light, you're reducing the lumens, making the light less bright. For instance, if a bulb is normally very bright at 1000 lumens, you can use dimming to make it 500 lumens, creating a gentler and cozier lighting effect.
CRI (Color Rendering Index) is a scale from 0 to 100 that measures how accurately it makes colors look compared to natural sunlight. Think of it like a scorecard, where sunlight scores a perfect 100 and represents the maximum possible color accuracy. The higher the CRI value, the better the color rendering capability of the light source. If a light bulb has a CRI of 90, it means colors under that light will look 90% as authentic as they would in natural sunlight.
CRI matters for home lighting because it affects how accurately colors are represented under artificial light. A higher CRI ensures that the colors of walls, furniture, decor, and even food appear true to their natural hues. This can enhance the ambiance, make activities like cooking or makeup application more precise, and ensure that interior design choices are seen as intended. In essence, a high CRI contributes to a more vibrant, comfortable, and aesthetically pleasing living environment.
Poul Henningsen (1894-1967) was a Danish architect, designer, and writer acclaimed for his revolutionary contributions to lighting design. His iconic PH lamp series, characterized by layered shades to diffuse light and create a warm ambiance, epitomized Danish modern design. Henningsen's work emphasized the importance of both technical innovation and aesthetic beauty in lighting. He advocated for democratic design principles and wrote extensively on design philosophy. His enduring legacy lies in his timeless lighting designs and commitment to making good design accessible to all.
