I'm trying to get a rough estimate as to the power in watts/cm^2 that an LED imparts to a surface a fixed distance away. For example, when I look at the specs of the BIVAR UV3TZ-405-30 LED, PURPLE, T-1 (3MM), 405NM, it lists 10mW for the typical Emitting Power. I've found various on-line calculators for converting candela to lumens, and lux to watts but I don't seem to have the right data and this is all very new to me. I get that the LED is projecting a cone-shaped beam of light that strikes a flat surface in a circular pattern. This size of the circle is based upon the viewing angle and distance from the surface. However, I get lost when reading about luminous intensity versus luminous flux and so on :shakehead
You guys sound like you really know what you're talking about so I'm hoping someone will take the time to help me out? I don't need an exact value. Anything close is good enough. I just want to know if there is a relatively easy way to either use the 10mW Emitting Power and the viewing angle, or to pick off a value for the Relative Luminous Intensity for a given amperage from the specification chart, to come up with a rough estimate for the real-life watts/cm^2 of power an LED imparts to the circular area defined by the viewing angle at a given distance away – like for example 5 centimeter away. I understand there are all sorts of tolerances and factors involved but I'm hoping there is a way to roughly estimate the actual power applied in a way that even I can understand?
LED: http://www.farnell.com/datasheets/1760165.pdf
Calculator: http://www.rapidtables.com/calc/light/lux-to-watt-calculator.htm
Thank you very much!
You guys sound like you really know what you're talking about so I'm hoping someone will take the time to help me out? I don't need an exact value. Anything close is good enough. I just want to know if there is a relatively easy way to either use the 10mW Emitting Power and the viewing angle, or to pick off a value for the Relative Luminous Intensity for a given amperage from the specification chart, to come up with a rough estimate for the real-life watts/cm^2 of power an LED imparts to the circular area defined by the viewing angle at a given distance away – like for example 5 centimeter away. I understand there are all sorts of tolerances and factors involved but I'm hoping there is a way to roughly estimate the actual power applied in a way that even I can understand?
LED: http://www.farnell.com/datasheets/1760165.pdf
Calculator: http://www.rapidtables.com/calc/light/lux-to-watt-calculator.htm
Thank you very much!