Well I figure these sorta things out by looking at what is already there.
46,-5,6,1,-1,0,0,10,1,no,0,0,0,weapon,0, AC_DOUBLE,Double Strafe
Oddly, Double Strafe's row 3 is set to 6 which is single hit... so I am guessing that the double hit is scripted in the src?
No matter, because we can still easily make holy light like Double strafe!
Step 1:
set row 3 to 8 instead of 6, so that it shows multiple hits.
Step 2:
set it's row 9 to the number of hits, which in this case is 2. Keep in mind that -2 would mean it does the same damage as a single hit(Like double strafe), but appears in 2, and just adding a positive 2 would cause it to do double the damage.
The result:
156,9,8,1,6,0,0,1,-2,yes,0,0x1,0,magic,0, AL_HOLYLIGHT,Holy Light
based on what you posted, your new line should look like the above example.
remember to change the -2 to positive 2 if you want it to do double damage.
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Also! you can even set it to go up in hits as you raise the skill level by adding : marks like so:
156,9,8,1,6,0,0,5,1:2:3:4:5,yes,0,0x1,0,magic,0, AL_HOLYLIGHT,Holy Light
In the above example I raised holy light's max level to 5 and gave it an additional hit per level.
I hope this helps.