can cause weird hotspots. i used the reflectix, same stuff i have on my walls - it's only just acceptable on the walls.
before here i got burned on some grows before it was pointed out to me. hermies in the bottom half was the first clue. i was blaming genetics, or anything else but me .... lol
got told to use the non-shiny side of tin foil, or duct tape, and it quit.
i haven't done active hydro since i got here, it was about a decade ago and i was under a mix of more primitive led, mh, and hps. i'm sure it has a part.
ever try side lighting? it rocks if you can. i would love to add side lighting. 180 degree is good but they get stressed with 360.
the lighter side of the leaf is not conducive to photosynthesis. leaves turn the back side and taco to avoid excess light/heat.
@Sativa1970 does this track for you?
500 scale measures nacl
700 scale measures kcl
500 scale = tds most places globally
500 scale is used more in eurozone
700 scale is a north american standard
ec is universal measure
ec is a measure of electrical conductivity (duh lol)
ec measures conductive ions in the water
tds measure both conductive ions and neutral material - ppm measure - parts per million, makes no distinction between conductive and non-conductive material.
pretty much how i've always understood the differences between the two scales, tds, and ec. my dad used to travel all over the place taking water samples for his job.
edit: i always express ec as decimal or value and decimal for clarity. ie - 0.5 or 1.2