LED grow light distance

This was a dm from them with more information about the light. ***************************** Hi, I can't answer on question. Than i will send u here whitch Led I have. The instructions that came with that light are extremely poor. It doesn't say the distance or how to use the UV light. That's why it happened to me that I left the 100w UVA UVB on for 3 days. https://ibb.co/xXvKvMF Photo of light Introducing Hortivision Led 680W/780W Spec-Perfect + Uv SPEC-PERFECT UV+ offers an optimised spectrum for effective crop steering, allowing users to select colour output, UV intensity and optimal PPFD levels for heavy yields and high potency. Built tough for rugged horticultural environments, the SPEC-PERFECT UV+ can be used in Urban Indoor grow rooms and tent setups. Three separate light channels for grow, early bloom and late bloom deliver the best possible spectrum at the three most influential stages of a plants life. Optimum Blue, UVA and Far-red diodes result in accelerated plant growth, increase flower site, flower density, higher yield & improved essential oils. Total Output 680W: 1870 μmol/s Total Output 780W: 1950 μmol/s Efficiency: 2.6 μmol/j CRI: 92.6 Dimensions: 1067 X 1105 X 54mm LED Chips: Osram and Samsung LED chips It is dimable 40-60-80-100% ***************************************** Their webpage is underdevelopment. https://horti-vision.com/ I did find it here though. https://hellohydroponics.com.au/products/hortivision-led-680w-780w-spec-perfect-uv

base it on PPFD and DLI of the light. Best to let people know what make and model you have. Almost most brands have a simple guide on seedlings/veg/flowering cannabis plants. Eg. My old light is weak, and could be 2" away from the plant no issues, my new lights are much stronger and needs to be min 25" away. another light I've used before was good at 12" A lot of the newer lights are designed to always be around 12-18" just different dim settings.