北美照明IES

Info: Definitions of IES Roadway Luminaire Classifications (Types I, II, III, IV and V) 窗体顶端 窗体底端 Summary: The Illuminating Engineering Society of North America (IESNA) defines roadway and area lighting fixtures by their photometric properties and distance to the half maximum candela trace and the maximum candela value.  The classifications allow designers to choose the proper product for their requirements. More Information: The definitions of the IES classifications follow: IES Classifications - The lateral classification describes the lateral light distribution with regards to the lighted area width described as multiples of the mounting height (MH). The width of the half-maximum candela trace within the longitudinal distribution range (Short, Medium or Long) is used. The boundaries for each classification in terms of Longitudinal Roadway Lines (LRL, running along the roadway) are as follows: ∙ Type I  - Half-maximum candela trace falls between 1 MH LRL on the House side and 1 MH LRL on the Street side. ∙ Type II - Half-maximum candela trace on the Street side is beyond the 1 MH LRL but not beyond the 1.75 MH LRL. ∙ Type III - Half-maximum candela trace on the Street side is beyond the 1.75 MH LRL but not beyond the 2.75 MH LRL. ∙ Type IV - Half-maximum candela trace on the Street side is beyond the 2.75 MH LRL. ∙ Type V - Has circular symmetry being essentially the same at all lateral angles around the luminaire.  Informally, there is also a Type V-S, similar to Type V, but square in shape. In addition to these types, the light distribution can be classified as Short (S),  Medium (M), or Long (L).  This refers to the luminaire's vertical light distribution and is based on where the maximum intensity (candela value) points to in the grid in the figure below, given in Transverse Roadway Lines (TRL, running across the roadway) as a multile of mounting height (MH).  The vertical distribution categories are defined as follows: ∙ Short (S): The maximum intensity points to a point in the S zone of the grid, 1.0 - 2.25 MH TRL. ∙ Medium (M): The maximum intensity points to a point in the M zone of the grid, 2.25 - 3.75 MH TRL. ∙ Long (L): The maximum intensity points to a point in the L zone of the grid, 3.75 - 6.0 MH TRL. The image below is Figure 22-7 from the IESNA Lighting Handbook, 9th Edition, © 2000, and is used with permission.  LRL = Longitudinal Roadway Lines, running along the roadway TRL = Transverse Roadway Lines, running across the roadway In this example, the luminaire is a Type III -- Medium distribution. 该照明工程学会北美（北美照明学会）定义其光度特性和距离的一半，最高坎德拉跟踪，最大坎德拉值巷道和地区照明灯具。的分类可使人员选择适合他们的要求，适当的产品。 更多信息： 在处分类的定义如下： 评价处分类 - 横向分类介绍了横向光分布区域宽度为安装高度三倍的描述。这50宽最大坎德拉跟踪在纵向分布范围（短期，中期或长期）的使用。在纵向巷道条件的边界线为每个分类（量程下限，沿行车线）如下： •I型 - 半最大坎德拉跟踪众议院落在一边和在街边一间一晚上量程下限荣誉勋章量程下限。 •II型 - 半最大坎德拉微量街方，但超出了一晚上量程下限不超过1.75氢量程下限。 •Ⅲ型 - 半最大坎德拉微量街方，但超出了1.75氢量程下限不超过2.75氢量程下限。 •IV型 - 半最大坎德拉微量街一侧已经超出了2.75氢量程下限。 •V型 - 有圆对称性在本质上灯具周围所有侧角度相同。 非正式的，也有一队型，V型相似，但在形成正方形。 除了这些类型的光分布，大致可分为短（s），中（M），或长（L）。这指的是灯具的垂直光分布，并在其中最大强度（坎德拉值）点，在如下图网格的，考虑到横向巷道线（4332320，整个行车线），作为安装高度multile（氢）。垂直分布类的定义如下： •短（s）：最大强度点，在网格，1.0的Zone点 - 2.25氢4332320。•中（M）：最大强度点，在网格，2.25米区点 - 3.75氢4332320。 •长（L）：最大强度点，在网格，3.75蜇区点 - 6.0氢4332320。下图是图22-7从北美照明学会照明手册，第9版，© 2000年，经许可使用。量程下限=纵向巷道线，沿行车线4332320 =横向巷道线，横跨公路运行在这个例子中，灯具是III型 - 中的分布