I am working in a matriz with UV LEDs with different wavelenght. My problem is more geometric, how can I distribute the LEDs in order to have a homogenous light in the surface?
The distance between the matrix and the surfae is 450 mm. I am using LEDs with opneing angles of 120º and 150º
Hi Raquel,
I suggest to use a simulation with Dialux4.13 (freeware) combined with simulation of led spatial distribution. It will require some work but Dialux will make all complicated geometrical computations for you.
450mm from the surface is very far for component at 120° FWHM thought...
(1) The application of LED irradiation simulation software is always good idea, but setting the model for simulation could be demanding.
(2) In the case of Lambertian LED source or of known spatial distribution sometimes is much easier to define own simplified calculation model that could be in form of EXCEL spread sheet, that will allow you to be more flexible (see file attached).
(3) As starting point you can use "Role of Thumb" that irradiation distribution is uniform when distance between LEDs in Matrix is approximately equal to distance betweer surface and LED matrix.
Good luck.
What's the size of your target ? You could set up a hollow light guide with reflecting side walls (made from Alanod miro or 3M specular mirror film). This helps in both energy transfer and uniformity.
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