I am not an electrical engineer or physicist. I am trying to understand if the light emitted by an LED poses an eye hazard.
A manufacturer has a device that has LEDs in it. They are infrared LEDs. They emit light at 950 nm and their 'maximum radiant power' is listed as 3000 mW/steradian. It is my understanding that W/steradian is called 'radiant intensity' by physicists.
To determine if the LED is a hazard, I need to calculate its irradiance, E, (Watts per meter squared). This is the equation I wish to use: E (W/m^2) = Sigma(from 770 nm to 3000 nm) E_lambda x delta_lambda. E_lambda is the spectral irradiance (W m^-2 nm^-1) and delta_lambda is source spectral bandwidth in nanometers (nm).
I cannot figure out how to use the given information (950 nm, 3 W/sr) to calculate the spectral irradiance or the source spectral bandwidth. Can someone help?
(Note added January 16, 2016) It took awhile but I think I found the datasheet for the LED. I know I wrote 3000 mW/sr in my original post, but when I spoke with the manufacturer I discovered that the LED in question is actually only 1000 mW/sr.
Here is a link: