Using HLG UVA

I believe it is for 4 hours per day for the last 3 weeks, or roughly thereabouts. Have light coming from above, not from the sides as some people seem to do, the light needs to strike the upper leaf surface. If you intend entering your grow space while using these lights, always switch them off or only enter when they are not running. Although the risk is small, repeated exposure to unfiltered UV A or UV B light can cause skin damage rapidly, mutating the skin cells' DNA, which can, in the long term, lead to skin cancers forming. Hope this helps,......... Organoman.

Depends on the output of the lights, but usually start with them 18 inches away or so and run them 2 hrs per day, during the light cycle, usually 1 hr at a time. If the light is higher to hit more plants, you can run it longer. Important thing to note is the UV has a systemic effect on the plants. So while a fully spectrum lamp you worry about the PAR map, a UV light does not have to have as good coverage, just let the light hit all plants at some angle. I run the Flower Power bulb for more UVB in addition to UVA and I have yet to note any burn, which is more of a concern the more UVB you have.

Hi mate, not to put a downer on you buy but UVA is a little pointless. You may get a little increase in terpenoids but not as much as using UVB. Seen a few of these manufacturers adding UVA to their quantum boards, including my own light manufacturer...I called him out on it though as its just another way of making money with no real benefit to growers results. If you intend on using it then only in the last few weeks of flower and for short times at the mid point of your day lighting schedule. Starting off with about 15 mins, increasing to two hours. You are simulation noon sun with is higher in UV light. I hope this helps, good luck and happy growing

I mins comes on with the light always but first grow so idk if it's beneficial or not yet

only one UVA - useless for boost cannabinoids. Cannabinoids + terpenes boost by combo UV-B + UV-A (try agromax pure uv or same uv-b lamp if you want boost all production on cannabinoids ) HLG UVA - use 12 hoursday (information from official site)

I have no experience using one (I'm considering it) but the Migro website recommends "2 hours mid-light cycle for the last 3 weeks of flowering" when using their UV light.