upgrading! need LED help

i am planning on upgrading my 4 gallon nano reef to a 10-15 gallon. i want softies and LPS and maybe a rbta maybe. i am leaning more towards the 15 if i can get it drilled successfully.

i was wondering if this would be enough lighing?
12 LEDs DIY kit

or if i would need to go with the 20 or 24 led model.

thanks! and what options should i get for it?

 

or do you have another seggestion thats not a par 38 and in the same range? i dont like the spotlight look.

that fixture shipped is like 83 bucks.

 

Check rapid led and they have a chart you can look at

 

Here you go see if this helps

How do I know how many LEDs I'll need?
There are various ways to calculate the number of LEDs you’ll need, and we’re always happy to recommend the correct kit for you. As a very general rule of thumb, for reef tanks without SPS you can use the following formula when using our LEDs:

(Length of tank in inches x Width of tank in inches)/22

For example, if you have a 40g breeder and your footprint is 36” x 18”, you would need:

(36” x 18”)/22 = roughly 28-30 LEDs



For tanks with SPS you can use the following formula:

(Length of tank in inches x Width of tank in inches)/18

For example, if you have a 75g tank and your footprint is 48” x 18”, you would need:

(48” x 18”)/18- = roughly 48 LEDs