Probably won't have a measurable effect either way.. but until i see hard quantitative data that shows a statistically significant increase to some positive aspect of weed, it's "magic."
Not testing a hypothesis is a sign of avoidance. This is how the 'supplement' market work in america. Make claims based on untested products... then never test them... when they are tested, they rarely show the same correlations as eating those vitamins as part of a normal diet in your food. A 25 year study with 10s of thousands of people tracked showed as much. If vitamin C helps you be less often sick, it is only true if you get it from from food source and the pill form has no such correlation. There is more to their 'effects' than the vitamin molecul in question. catalysts, enzymes and whatever else in the food is important to the effect being realized.
Light powers growth. Ripening is 'growth.' This would be an uphill battle to be worth it. It wouldhave to overcome the benefits of 2 days of energy used to build the molecules that make up the plant - including maintaiing trichomes etc.
I've heard that some lab did an informal study and there may be some potential that it increases potency, but in the years since i heard this (by mouth, not read) i;ve come to doubt it more and more.
either way, it won't make a difference you can feel or see. The typpe of diffeences would need precise equipment to do so. The only real life difference it may impact is longevity of the buds... at some point it falls below a threshold of 'quality' and if it starts at a slightly higher point it'll stay above that threshold longer.... but, again.. i highly doubt it matters.
do what makes you feel good. It probably doesn't have a noticeable effect either way. Your eyes can not test potency. when you smoke or vape it you won't tell a difference between a fraction of a percent potency difference. 2 days out of 60 flower phase days will not have a huge impact on much of anything as far as anything positive... could obviously cause catastrophe in 2 days if you wanted to, lol.