Weak full spectrum led place in front of window enough to finish bloom?

Hey! When it comes to LED lights.. it's recommened 50-75W per 30cm2 To answer your question yes, if it's output is that of a 40W LED and with the additional sunlight from the window you have enough to finish bloom. But that doesn't mean you'll get the outcome you're probably waiting for.. I understand you have some sunlight but by the looks of it your in the nederlands and in this season it's mostly cloudy, so i don't know exactly how much sun she will receive. If you were only to depend on the LED light most days, you would need another 15-25w to have a decent yield. Not ending up with fluffly buds, risking budrot or any other problems that could occur from not having enough light source. Remember light is energy to process food and grow so if they don't have enough they won't be healthy and won't have dense, rich flavory buds. Try this light but i suggest you add maybe an extra led or some CFLs on the side. Hope this helped. Good luck and happy growing!