Wanting to do an off season grow in the Upper Puna district on Hawaii island, beginning late September (have medical permit from state). We are located about 1000 feet elevation with 200 plus inches of rain annually. Rains can be very heavy and can damage and flood plants, but we have great drainage. Plants to be under a metal canopy frame with greenhouse plastic roof (pitched which will help with better airflow and height) that allows light into grow area, from our experience. We use a drip system on a timer and have a soil tester for moisture and PH.
We have about 12 hours of daylight throughout the year so we need to supplement the daylight to 18 hours. We have access to power from electric company (46 cents per KWH). In addition, as we move into Fall and Winter the sun is blocked more by trees around our lot. Also more overcast and rainy days.
We have three light choices for supplementing lighting:
Viparspectra 300Watt equivalent LED full spectrum designed for indoor grows when positioned 24 inches above plants (drawing 200 watts) but light will be positioned at highest point in center of outdoor structure.
A 36 inch long fluorescent fixture with five T5 bulbs emitting 20K lumens 6500K blue.
Four LED floodlights equivilent to 60 Watt bulbs each but draw about 10 watts each. Any of these lights can be hung in the highest part of the structure which is 10 by 14 feet total and 12 feet high at center.
Six plants will be closer to center of structure in 30 inch diameter fabric containers. Lights would come on at 5PM when sun falls behind trees and on until 10 PM. Which light choice would be best to maintain Veg stage and possibly increase yield?