From Event: SPIE Optical Engineering + Applications, 2016
In this paper, we consider the problem of designing energy efficient light emitting diodes (LEDs) layout
while satisfying the illumination constraints. Towards this objective, we present a simple approach to the
illumination design problem based on the concept of the virtual LED. We formulate a constrained optimization
problem for minimizing the power consumption while maintaining a near-uniform illumination throughout
the room. By solving the resulting constrained linear program, we obtain the number of required LEDs and
the optimal output luminous intensities that achieve the desired illumination constraints.
Ramy E. Ali and Hany Elgala, "Energy efficient LED layout optimization for near-uniform illumination," Proc. SPIE 9954, Fifteenth International Conference on Solid State Lighting and LED-based Illumination Systems, 995406 (Presented at SPIE Optical Engineering + Applications: August 31, 2016; Published: 7 September 2016); https://doi.org/10.1117/12.2235262.
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Study of self-shadowing effect as a simple means to realize nanostructured thin films and layers with special attentions to birefringent obliquely deposited thin films and photo-luminescent porous silicon