Bounce Lighting
Bounce lighting achieves a large light source surface area by using a surface of the space as a diffuse reflector. A common example is using a floor-mounted torchere lamp to create a bright spot on the ceiling adjacent to a task area. Wall-mounted sconces bounce light from both walls and ceilings, which can be efficient for some task layouts.
At present, bounce lighting is used primarily for area lighting, which can be done on any scale. For example, the subway stations in Washington, D.C. are lighted by upward-aimed HID fixtures installed on the subway platforms that bounce light off the concrete ceiling. Bounce lighting has rarely been used for task lighting.
Bounce lighting has several advantages. Many common types of fixtures can be used to project light on a surface, so equipment is inexpensive and installation is simplified. Also, you can create a virtual light source of any desired size. Bounce lighting makes it easy to keep the lamp hidden from view, eliminating light source glare.
The main disadvantage of bounce lighting is inefficient aiming. Bounce lighting provides no control of light distribution other than by proximity to the task. The “standard” task lighting layout defined previously requires the lights source to be above, alongside, and somewhat behind the viewer. If a fixture is aimed at this location on the ceiling to create bounce light, a large fraction of the light is lost outside the visual field.
You can use reflectors to reduce this light loss, as discussed below. For example, aim a directional lamp into a reflector to concentrate the reflected light toward the task. However, aiming is crude even with such arrangements. Experiments conducted by Wulfinghoff Energy Services, Inc. showed that the energy efficiency of bounce lighting cannot approach the efficiency of other methods of task lighting. Diffuse reflection simply does not provide sufficient control of the light distribution pattern.
Absorption losses for bounce lighting are about the same as for diffuser and reflector fixtures. The absorption of typical clean white and light pastel surfaces ranges from 15% to 30%
Bounce LightingBounce lighting achieves a large light source surface area by using a surface of the space as a diffuse reflector. A common example is using a floor-mounted torchere lamp to create a bright spot on the ceiling adjacent to a task area. Wall-mounted sconces bounce light from both walls and ceilings, which can be efficient for some task layouts. At present, bounce lighting is used primarily for area lighting, which can be done on any scale. For example, the subway stations in Washington, D.C. are lighted by upward-aimed HID fixtures installed on the subway platforms that bounce light off the concrete ceiling. Bounce lighting has rarely been used for task lighting. Bounce lighting has several advantages. Many common types of fixtures can be used to project light on a surface, so equipment is inexpensive and installation is simplified. Also, you can create a virtual light source of any desired size. Bounce lighting makes it easy to keep the lamp hidden from view, eliminating light source glare. The main disadvantage of bounce lighting is inefficient aiming. Bounce lighting provides no control of light distribution other than by proximity to the task. The “standard” task lighting layout defined previously requires the lights source to be above, alongside, and somewhat behind the viewer. If a fixture is aimed at this location on the ceiling to create bounce light, a large fraction of the light is lost outside the visual field. คุณสามารถใช้สะท้อนแสงเพื่อลดการสูญเสียแสงนี้ ตามที่กล่าวไว้ด้านล่าง เช่น เล็งทิศทางไฟเป็นรีเฟลกเตอร์สมาธิไฟสะท้อนไปสู่งาน อย่างไรก็ตาม เล็งเป็นดิบแม้ว่าจะ มีเรื่องดังกล่าว การทดลองที่ดำเนินการ โดย Wulfinghoff พลังงาน Services, Inc. แสดงให้เห็นว่า พลังงานของแสงสะท้อนไม่เข้าประสิทธิภาพของวิธีการอื่น ๆ ของงานไฟ การสะท้อนกระจายก็ให้รูปแบบการกระจายแสงการควบคุมเพียงพอ สูญเสียการดูดซึมของแสงสะท้อนกำลังเหมือนกับติดตั้งแผ่นสะท้อนแสงและแผ่นกระจายแสง การดูดซึมทั่วไปสะอาดสีขาว และแสงสีพาสเทพื้นช่วงจาก 15% เป็น 30%
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