Terry, I do not grow in a greenhouse so am not up to speed on lighting. I use cool white and warm white florescents for my seed starting, but I do mostly tomatoes and start six before outdoor planting at the end of May. I suggest you contact the light manufacturer for specs. Hydroponic stores are also a possible source. Charley's Greenhouse is another place to go. Congrats on your greenhouse. Heat will also be an issue so you will need to do some automatic venting and get a fan. On a sunny day in February my conservatory will pump up to 100 degrees or more. Best And Happy Yardening, Nancy.