When I was working with some Reefbrite XHO lights, they did not dim below 7%... they were quite dim at 7%, but still were on and did not dim any further when the Apex intensity was 6% or less. That was a few years ago, and I do not know if they have changed anything. You can find out yourself with some simple testing that will only take a minute or two.
Temporarily program the variable speed output which is connected to the XHO driver like this:
Set 10
This will force the light to 10% intensity. Send that new program to the Apex. Look at the XHO fixture.
Do this again, but use Set 9. Watch for the light to dim a little bit immediately after you send the updated program. Repeat 1 percent at a time ( Set 8, then Set 7, etc) until you find the intensity value at which the VHO no longer dims. To reiterate, for me, that value was 7%.
The program the variable output for the lighting schedule you desire. Make the first and last schedule point at the time you want to lights to turn on and to turn off respectively, and configure both of those to the minimum intensity you found during the testing. I created this example to have the 7% start and end intensity that was the right value for me:
XHO.PNG
Because the lights can't be dimmed below X%, you need to plug the LED driver into an EnergyBar outlet so it can be turned on and off to match your VarSpd schedule
In my example, my lighting period starts at 08:00 and ends at 21:00. So the programming will be:
Fallback OFF
Set OFF
If Time 08:00 to 20:59 Then ON
This is the simple way, but if you change the lighting schedule in the variable output, you have to remember to also change the times in the EB outlet program. Instead, in a form of "working smarter, not harder", you can let the Apex handle it automatically so you don't have to hard code times in the EB outlet program...
Fallback OFF
Set OFF
If Output XHO Percent > 7 Then ON
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