So called Aryans were not white. The most elevated of all gods, Lord Krishna, is described as the black one in the Vedas, and in the Upanishads, he’s known as “Shyam,” meaning the dark one. Aryan is not even a race or group of people. The word Arya is more of an adjective than a noun. So called Dravidians – in the Ramayana the King of Lanka, that is Southern India, Dravida is addressed as Arya by his wife. Arya means noble, wise, Lord, a sign of respect like the Japanese use -san at the end of name while addressing a person. Get over it White people. Everything’s not White created.
30-40% of the Aryans had blond hair and blue or green eyes. We know this because this is what Indo European speakers in Russia looked like 5,500 years ago before they moved down into India 3,500 years ago. So 5,500 years ago, Aryans indeed often were blond and blue/green. The question is whether and how much they changed moving down from Southern Russia through Kazakhstan, Turkmenistan (where they formed a huge civilization), Iran, Tajikistan, Afghanistan, Northern Pakistan and Northern India.
Did they suddenly get much darker in the ensuing 2,000 years? I tend to doubt it. And actually the caste system they set up was very much race-based with the lightest folks at the top descending to the darkest Shudras and Dalits at the very bottom. It very nearly resembled other colorist systems such as the Jim Crow South, Apartheid South Africa, and Casta in New Spain. The Aryans were practically proto-Nazis and proto-crackers.