You really need some way to measure par to be able to know how close to put the light. There are apps for your phone that measure light, and you can buy a cheap bluetooth par sensor on amazon that links to an app on your phone.
YOCTOSUN LED Head Magnifier, Rechargeable Hands Free Headband Magnifying Glasses with 2 Led, Professional Jeweler's Loupe Light Bracket and Headband are Interchangeable https://www.amazon.com/dp/B07T4KPYN2/ref=cm_sw_r_apan_glt_i_MDG6YEGHVMR6FVRDTMVX?_encoding=UTF8&psc=1
Last year I went on a 2 week vacation, so got a Blink security camera and this irrigation system — it was a bit confusing to figure out how it worked at first, but it did me well and saved my plants while I was away!