Underwater LED Array

Pacer conducted a feasibility study to determine the optimum construction of an LED light source for an underwater fish farming light.

We initially reviewed the concept requirements for an LED light source to be utilised in an underwater lantern, intended for the fish farming industry at sea depths up to at least 70m. The requirements flow down from the original 4000/5000K Metal Halide lamps used at present and concentrates on the relevant wavelengths that are of interest in the marine environment. The whole product was required to be contained within a Bora Silicate (Pyrex) glass container, if possible with a reduced length from the current 450mm.

Important considerations included the attenuation factor for light transmission in water and the radiated power vs wavelength for the lamps, as well as robust design, high reliability and long operating life. Finite element analysis was performed and in particular, thermal considerations were key; as the only real method of removing heat was through the glass in the form of radiated light, infrared and direct conduction, the transmission of heat through the glass dictated the basic power the LED lamp could handle given that the LED die temperature must be kept below 70°C.