Supplemental lighting for Winter Greenhouse (new grower)

Hi everyone..noob question for a small outdoor greenhouse winter grow. Got a small 5x5 greenhouse to grow a few autos in years round and try a few new techniques with light deprivation and such later on. Anyways..it is almost January and here in Northern California it is around 65 or 60 during the days and 40 at night outside. In the GH much hotter of course..without anything in it..I need some info on supplemental lighting..Someone said this unit would be good and I could use a MH bulb in it for veg and then switch back to HPS for bloom.

Anyways..any advice would be greatly appreciated....I don't need to buy a new cob light or quantum board setup. Have those already. Just something minimal to keep them in veg and help with along till the auto's flowers and give medicine. Thanks.

https://www.amazon.com/Sun-System-Grow-Lights-Hydroponics/dp/B00KM1EXXW/ref=sr_1_4?s=lawn-garden&ie=UTF8&qid=1514579839&sr=1-4&keywords=HID+grow+light

That'll do it for supplemental lighting....And if 150 watts turns out to be not enough, then I'd buy an adjustable digital ballast...then you can mess about with 250/400/600 wattt bulbs with the one light ballast.
(This indoor tent grower DREAMS of growing in a greenhouse, you lucky thing! )

Ended up purchasing two 300 watt hp vipars with the new convex lenses..they were 90 a piece..figure for a budget outdoor extra it would do. Going to grow six true og clones and see what happens. Yeah wish they wouldn't of used prop 64 to cut off most city and county districts with their medical grows. It is total bs..rather than protect 215 patients they used the cover of the new law..we are currently lucky to grow outside at all..crossing fingers and knocking on woods..if we have to go back inside...at least we can. I got a cob set up for that but going to use the new cheaper lights for veg tent. Thanks for the reassurance sworth..this journey has been fun..so much to learn..so much more to learn..and the stability it brings to my family member the patient a disabled vietnam veteran..makes me happy that I can do something to help him for once.

I hear that "stability in the family" thing... life is markedly better in this home now that nobody has to worry about where to get some herb... " It gets all those emotion corners rounded off " as someone here puts it