What is the best wavelength for the UV strip to build a light box?

I am a college student and our next project is to build a UV light box to expose photoresist dry film on copper and then etch the copper, my question is: What is the best wavelength for the UV strip, the lightbox is 12 x 9 inches and I was planning on using around 30 watts of strip.

We unfortunately don't have any extensive data on photoresist materials and their wavelength sensitivities, but it does appear that 365 nm is a popular option for many of our customers who require UV-A for photochemical processes.

​We've provided a link to the 365 nm UV LED strip light below. At a power consumption of 4.5 watts per foot, you should be able to achieve the 30 watt power target using approximately 6-7 feet of the LED strip light.

https://store.waveformlighting.com/collections/realuv/products/real-uv-led-strip-lights?variant=12339996721254

For additional connectivity and wiring information, you may also find the diagrams below helpful:

https://www.waveformlighting.com/layoutmaps/7021_4A?px=-2539&py=-2673&pw=2078&ph=2346&s=0.1

https://www.waveformlighting.com/layoutmaps/7021_4C?px=-2539&py=-2673&pw=2078&ph=2346&s=0.1

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UV-A LED strip lights

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