The British are a bit lacking in light infantry regiments in this period. I assign 4 light infantry of the same type (rifles or muskets) to each full stack. After scouring the internet for a bit, this is all I can come up with, and some of them I'm not even sure fought in theater, but here is what I have so far:
43rd (light infantry)
51st (light infantry)
52nd (light infantry)
60th - 5th, 6th(?), 7th(America only?) (green jackets)
68th (light infantry)
71st (light infantry)
85th (light infantry)
95th - 1st, 2nd, 3rd(?) (green jackets)
KGL - 1st, 2nd (green jackets)
Chasseur Britannique(?) (light infantry)
Portuguese Cacadores(?) (light infantry) (not even allied with them atm though lol)
I'm trying to stretch the rifles by giving 80-man units battalion designation rather than regiments but I kept the 120-man unit designations as regiment.
As you can see I have enough light units for 4 full stacks, 2 equipped with rifles and 2 with muskets. I would like maybe 2 more light infantry units for the Gibraltar garrison. Are there anymore light regiments? Scraping the barrel here.