Asalaamualaykum, what does the below hadith mean when it says the reciter will have a light between this friday and the next?

Quote:

In his Mustadrak, Al-Hakim recorded from Abu Sa’eed that the Prophet, peace and blessings be upon him, said:

مَنْ قَرَأَ سُورَةَ الْكَهْفِ فِي يَوْمِ الْجُمُعَةِ أَضَاءَ لَهُ مِنَ النُّورِ مَا بَيْنَ الْجُمُعَتَيْنِ

Whoever recites Surat al-Kahf on the day of Friday will have a light for him between this Friday and the next.

Source: Sunan Al-Kubra 5856, Grade: Sahih