Light timing:
Generally all my lights have a flash frequency of 3.0 to 4.5 except for some super fast LED flash patterns.
Some lights may be un-synchronized IRL so having slightly different flash frequencies can achieve the same look. If they're sync'd then they should all be the same frequency.
Flash intensity will depend on the lighting type you are creating. Halogen has a very low flash intensity between 0.0 to 0.3 while strobe has the highest possible setting at 0.99
Flash offset is the key to creating patterns. Lets take 2 lights, A and B:
....if A has an offset of 0, and B an offset of 1, then you will get a left/right alternating pattern.
Polygon lighting:
Halogen and strobe are a single polygon with the color that you want (red, blue whatever) but adjust the color settings so the polygon is a dull, gray-ish variation of whatever color you do. Halogen/strobe white tends to be off-white with a bit of yellow from what Ive seen so thats what Id advise.
LED requires you to double up (clone) a second polygon light over the first. Using the "polygon glow" setting is also highly advised. For the first polygon, go with a solid color with no mixing of white. The second polygon (the clone) should be all white, or be a whited-out version of the original color.
Strobe and LED double (or triple, or quad) flashes:
This is easy. Just make the light, but then copy paste a second one into the light editor. It might be in the exact same position with the same attributes as the original. What you do next is bump up the flash offset by 0.25 or 0.50 depending on what you feel.
Lets say the original flash has an offset of 0.0. The second flash will be 0.25 and the third will be 0.50
You can also try differing combos like 0.0, 0.3, 0.6, 0.9 and so on. A common one used is 0. and 0.5
The weirdest one Ive done was 0.3, 1.4 to get a "skipping effect". Feel free to go crazy with this.