Light Leaking + A Bit of Thinking

Yo! How much does it matter if light gets into your flowering room? i cant get it full light proof cause ive literally split a cupboard in half one for veg one for flower. Any ideas of how i can make it better?

Light leaks are the worst. They can literally ruin a grow. I have seen insignificant looking light leaks ruin a harvest.

TrueDat Dont let ANY light leak, u want full darkness