The approach taken is to look at the design options from a functional requirements perspective, assessing the engineering requirements to build a functioning fixture. This document outlines several design options for a liquid cooled Light Cannon fixture. The performance and size characteristics of a given design are assessed, and then compared against air cooled design options of the same size constraints providing equivalent or better light output and beam profile. The final conclusion of this analysis is that the only situations where liquid cooling can be justified are for high brightness flood fixtures and high brightness linear fixtures with tight beam control in 1D and a very broad beam in the other direction. Alternate cooling technologies such as heat pipes, air jet impingement, etc. have not been considered as they have been interpreted as out of the scope of the IRAP project mandate as per previous discussions.
Chemical testing was carried out on a number of compounds to assess their compatibility for close contact with LEDs in Nemalux fixtures. This test is accelerated stress test, designed in a way that it will produce noticeable degradation on relatively short time-scales ( This test is unrelated to chemical compatibility of compounds with encapsulation materials. The chemical compound of interest is applied directly to the LED surface where possible, and a low volume glass vial is sealed over top of the LED and test chemical using a compatible sealant such as Arctic Silver epoxy or 3M TC-2810 epoxy. In cases where the chemical compound of interest is an aerosol, the compound is sprayed into a glass vial and the vial immediately placed into an already-prepared adhesive ring around the LED in order to trap as much of the aerosol components as possible. The sealant is allowed to cure fully before powering the LEDs at a current setpoint representative of their use in a product. The test fixture is powered on continuously, with notes and photos taken at intervals to track degradation of the light output.
We have been approached regarding the suitability of our products for use in high radiation environments. Given our existing installations at nuclear power plants, this may be an attractive market for us to target as word of mouth and keyword searches identify Nemalux as an option for these kind of installations.