CMH 315 light hanging distance

[Smallgrow]

Hi all,
I’m trying to get the hang of my 1st real grow. I have been keeping my Silverstar vertical CMH315w light at about 36” above the canopy in my 3x3 tent. I did this hoping to eliminate light burn (light issues) as a possible problem as I try to learn my plants, there’s enough other variables.

Ive read all the GWE light distance and CMH grow info, and I finally picked up a DR.Meter (LX1332B)light meter for a little more info. I understand it’s not the be all, end all type of light meter, but it’s a bit more data.

Currently it reads no higher than about 25000lux anywhere on the canopy. This is pretty low , I think I can lower the light safely. What would be a safe lux range for a light like this on the DR.Meter?
my plants are an auto Blueberry and auto Zkittles in last half of flower.
I don’t need to push the limit at all , but I would like them to have as much “food” as they can get safely.

Any suggestions or help would be much appreciated.
Thanks, and happy growing!

[dphipps1020]

I would say you can probably drop your light a good 6-12". I think the range they like goes up to 50000, any more than that and they don't really use the extra energy. I used to use 315 CMH lights but upgraded to LEDs because of the heat. I never really checked the height, I just got it close and adjusted as needed.

[Smallgrow]

Thanks , I’m wonder if too little light is a possible source (or part) of my nute deficiencies . The learning continues