Q.What is the best grow light??
Hi!! I just bought a 5 foot by 6 foot by 7 tall portable greenhouse.. One with the green cover.. I live in Eastern Washington State, zone 6 and want to start seeds in it and also bought a heat mat and starting trays with plastic domes.. We still have 12 inches of snow on the ground so I plan to put the GH on my covered deck which gets about 9 hours of light but no sun.. I then plan to move the greenhouse to my garden area when the snow melts and I can prepare a good spot for it there.. I get about 6-8 hours of sun in the garden area in spring and summer.. My question is: Do I need a grow light in the GH to start seeds and if so what is your recommendation as to the best one for it?? We are currently having a late winter and it is in the teens.. I was thinking of putting an oil filled heater in there also to keep the temperature up.. Any advice will be greatly appreciated!!! Thanks Pat Collins

Certified GKH Gardening Expert
If you get at least 8 hours of sun, then you likely won't need a grow light. If you just want to provide enough for seedlings, then you really won't need anything more than a T5 panel. You really don't need a whole lot of light for seedlings, and outdoor light will usually be plenty.
https://www.gardeningknowhow.com/houseplants/hpgen/what-are-grow-lights.htm