need help with light set up for cacti

pledge123 Mahopac, NY Dec 27, 2019

I am new to growing these Trichocereus cactus. The links on the bottom are for 2 new grow lights i have just curious about the height i should hang them over the cacti....I have a couple seedlings grafted onto peres and a couple of the "penis plant" version any help would at least give me a starting point or if you guys know what i should look out for that would mean they are to close or to far away like i said NEW to these

https://www.htgsupply.com/products/agromax-otd-led-grow-light/

https://www.htgsupply.com/products/t5-led-bulb-4-foot-full-spectrum-agromax/

i also have this light below in another area but if the 2 above arent enough i could swap it out for this one

https://www.htgsupply.com/products/htg-3-0-810w-cob-led-grow-light/

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