Determination of Optimal Component Spacing in a High Power Light Emitting Diode Array Assembly for Solid State Lighting

This paper provides an analytical and systematic approach to determine the optimum pitch by utilizing a thermal resistance network, under the assumption of constant luminous efficiency. This work allows a LED array design which is mounted on an organic or metal-cored printed circuit board (PCB) attached with a heat sink subject to the natural convection cooling. For emonstration, the methodology is applied for the design of a LED tube for the drop-in replacement of a 4ft T8 fluorescent lamp. Being validated by finite element (FE) models, the current approach can be shown an effective and efficient one for the determination of an optimal component spacing in a LED array assembly for SSL.