I know a lot of people are a bit apprehensive running 730nm on a separate timer - I myself have been burned by the 730nm timer getting off and coming on at the wrong time due to power outages, etc... So, after seeing the HLG solution I got to thinking. I"m pretty sure you could use a dusk/dawn photocell switch (made for outdoor lighting) and a cheap cycle timer to take care of it. I have a cycle timer that runs on 12V DC, I bought a $3 photocell sensor that is made for DC up to 10A. My cheapo 10W 730nm "cob" also takes 12V to run. So, I can use a cheap 12V ac/dc brick to both power the cycle timer and run my 730nm. The sensor allows power to flow to the cycle timer when lights go out, cycle timer is set to come on by default and then stay on for X seconds then turn off. The light sensor then cuts power to the whole circuit when lights come back on.... I ordered the sensor, I have all the rest of it... I'm going to test it when the sensor arrives and report back.