lights over acrylic tank cross brace

[reeferdale]

I am getting ready do my LED build. On my 270 acrylic tank. I have on center cross brace that is about 3 inches wide. Just looking for opinions on whether to run my lights right across this brace or make seperate 'fixtures' that fit into just the openings.

I am not sure if the lights will casue the brace to yellow or become brittle over time or would they cause the light spectrum to shift to an undesirable spectrum?

thanks