Finally, after months working on a hotplate to reflow solder my LED panels, I have finally assemble the box back with the new angled-panels. 

I have changed the colour configuration also. Now the 4 panels have blue light. This is to increase the pulse actinic light to around 6,000um. The other half have 2 white panels and 2 red panels.

The 4 panels are covered by the filter and sealed on the sides to prevent light leakage.

If you want to see my reflow hotplate, you can find it in the link below:

http://maykef.co/2021/03/02/a-diy-reflow-hotplate-for-small-aluminium-core-pcbs/