The panel i made is with 4000K of 15 meters LED Strips. Chose the 4000K "neutral white" because is not the very warm white but not either very cold white like the 6000K are. Led Strip is rated 430 Lums/m so 15 X 430= 6450 Lums For The power supply i used a simple 12V DC 6A (72 Watt) Plexiglass used 500mm X 500mm 3mm white color

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Very nice work ..... Just a few thoughts ....

You can get strips with leds packed much more densely than the ones you used ...

Using these you could either space the strips apart and have about 1/4 of the soldering to do ...
or space them as you did and have 4 times the light output .... or have some warm , come cool ,maybe some coloured and adjust which are switched on for different lighting effects ...

 

Thank you for your kind words

I have thought of ot to but this strips are far more expensive and i had them for about a month and used them...