CPrince

@gzaharYour explanation was spot on. I read the first three words and it instantly made sense. @MrBilland @apostolakislYou guys really drove it home with your in-depth explanations. Thanks so much

Mr Bill, My brain is fried. The second example worked fine. At first I thought it didn't. Review of the security cameras proved that it did. I am at a lose with the "for" argument. I did a lot of reading on it and am no better off. I am reading the 700 page ISY Automation Cookbook. What does the 6 represent? I changed it to 2 as I thought it was going shut the lights off in 2 hours. Wrong.

MrBill, sorry I did not see you full response to the second part. let me review,

MrBill, thanks for the fast response. You first solution is spot on. I had to poke around to find the settings. It was a great learning experience. The second example makes some sense, but is not clicking. I may be a bit slow. Sorry. So it has to be sunrise -30 (4:45 currently) and 5:30. to hold off turning the light on at 5:30. It should work today and for a few months. But the window from 4:45 to 5:30 will be locked in because of the and 5:30? So what happens in December? Sunrise -30 (6:00 December time) and 5:30. Won't the 5:30 make the logic false? Doesn't the and 5:30 kinda hardwire it in? Thanks so much!

I would like to do some more advanced sunrise/sunset programs. Sunrise/sunset is relative to the earth and the sun, but not really the time of day. Time of day is a constant and sunrise/sunset is variable. With that being said if I want to to turn my porch light on at sunset -30 minutes and off 6 hours later in the month of December it will be different in July. In the winter the light would come on around 4:30 and turn off around 10:30. This is good. However running this is July will turn the lights on around 8:00 and off at 2AM. This is bad. I thought of breaking this down in to 2 separate programs. One to turn on the lights and 1 to turn off the lights. However I don't want them going off at the exit same time every day. Maybe 10 PM plus or minus 30 random minutes. I can't see how to do a plus or minus random number. Every controller I have worked with has had this function. Another issue is the lights in th AM. Lets say I want the lights to come on at sunrise -30 minutes but not before 5:30. Sunrise right now is 5:30. So the lights turn on at 4:45. This is bad. In December the lights would come on at 5:45. This is good. I am new to this device, sorry if this has been asked many times.