I don't know this unit but I've found that these triggers occur when the gate is opening and when its closing. You either need an additional driveway sensor and write a complex conditional where which sensor is triggered first matters, or to follow Harris and provide a contract at the gate tracking its state. Otherwise, you are triggering you macro when a car leaves at night rather than when it's entering. Perhaps I'm in error with this unit and it only outputs 12v when opening. But how will you know if a car is entering or leaving?

The quote from page 14 of the manual says the siren signal is present when the gate is moving, so, yeah, it does not differentiate between opening and closing.  Since the goal seems to be to provide light rather than to inform as to whether someone is entering or exiting, it seems okay to me. Wouldn't you want light when you're entering and exiting?

Sorry boys, forgot to say that client has two gates, and the one I'm trying to automate is the entry one.
Entry gate opens, lights come on for 20-25minutes. Since the gate is on a 90sec auto-close settings, I won't care if the sensor triggers again on gate close. In my case that would mean that my 20min routine would actually stay on for 21.5min. Obviously not a big deal to adjust the timer to compensate for the gate auto-close sensor tripping.

And you can get various timers, notably little alarm type PC Board assemblies, that will let you start whatever length timing cycle you want from, say the start of that 20 minutes cycle. Thus you can set, say, a five minute cycle. It doesn't have to be a 21.5 minute cycle.

A detail is that you'll need a one-shot to convert the long ON state to a short pulse to reset, then start, that little timer. Anything can be done; just tell us what you want, what you have, and HOW MANY.

With HAI, all that is done thru programming/flags/zone states.
Easy as pie.

And what happens when he's leaving rather than entering? Lights going to come for 20-25 minutes?

The gate opens.

Two gates.
Entry gate has the hardware to turn on the lights.
When leaving, the opening of the front door, or the garage door triggers the programming.
The exit gate does nothing.

and theeeen

the gate closes

I get from this latest exchange:
sorry boys, there are two gates
details details details about the main gate that we've been discussing
then
it doesn't matter at all that there are two gates.

So I'm confused about this now. If the second gate doesn't matter to this whole thing, why mention it, or why mention it without stating right then that it's just a detail that doesn't affect what you're trying to do?

Ernie, I forgot to mention in OP that this was a dual gate installation.

The only gate I'm concerned about is the entry gate, so that when the gate opens and it's dark, the driveway lights come on.

Then one of our friendly R.C. CIs asked what would happen if the gate opened on exit, presumably he was assuming there was only one gate.

So I went on to explain that entry gate turns on the lights when arriving; garage and/or front house door opening turns on the lights when someone is exiting the property.
No one cares and nothing happens when the exit gate opens/closes.

Today I got to the project, armed with RB5 relay board.
Opened the enclosure and searched for a siren output or the like without any luck.
Looked at the board once again and noticed that it wasn't the same as what Ryan linked to. This is the board that they have: [Link: apollogate.com]

What I ended up doing is getting power from the gate motor (black=ground and black= +12V when gate opens/ -12V when gate closes).
The relay powers on the gate open cycle, opens N.C. relay output which in turn is tied into the HAI.

easy peezy

[obligatory comment about model number]