For me looks like 4*ALS (with the same space between)
plus: the 3th light from left: looks like a "Lead-in Light system (LDIN)"
plus: the (small) light in the middle: I don't know, what this is.

ref - good question: I know from other airports different ref/numbers per (single) light.
Here it could be also a ref for the lattice mast, not for the (different) lights.
