I would only leave the veg side on during veg to avoid the stretch that usually comes when adding in red (red usually signals death to plants so they flower to prolong the species..Most manufacturers of these lights say to use the switches like that..
I got this from my Meizhis that I only use in Veg at the moment.
"MEIZHI Reflector-Series 450W LED Grow Light Full Spectrum(my edit: actual is 195w +/- 5%)
for Indoor Plants Veg and Flower - Dual Growth/Bloom Switch Daisy Chain Following the product manual, please pay attention to the NOTICE before you start use. I really hope it may help you a lot.
Advised light above plants for seeding,growth and flowering time:
Germination-------------24-30 inches
Vegetable -- --------18-24 inches
Flower------12-18 inches
Advised Lighting Time:
Vegetative Stage: 18-20 hours on,4-6hours off; Flowering Stage: 12 hours on,12hours off. Veg: 18/6 or 20/4; Flower: 12/12
our new series lights have both growth and bloom switches.
On growth stage, keep the growth switch on.
On flowering stage, keep both veg & bloom switches on.
Advised Growing Conditions:
Temperature, humidity and airflow will directly influence the rate of photosynthesis and transpiration. Although the environment for plants growing is limited, growing conditions means a lot. It shows that the perfect temperature and humidity for your plants are found between 75°-85°F and 50% - 70% humidity, with plenty of airflow to replenish CO2.
The information above are just collected according to the data which given by customers actually planting.
Notice:
1. Keep suitable distance between light and top of plants based on your real planting condition. If too close, might burn plant leaf out.
2. Please keep the light working under regulated and stable voltage
3. The light is not water-proof
4. Please move out the light when use Sulfur
5. Please turn off the light when the fan stop working"
