Hello,
I have a 200 W LED grow light and want to know where the grow distance measurement should start? For flowering, my light should be 12-18 inches away from the plant but is that the top of the plant, the center or the bottom? Just want to get my measurements right.
Thanks!
@soarhigher4 you want to measure from the top of your canopy.
What kind of light do you have, you probably can get it closer than that depending on the light
Thanks! I have VS2000 LED 200 W full spectrum grow lights.
Your light manufacturer may have suggested intensity and height settings to get started. But they are just suggested as a general guidline.
You can download the photone app online to read ppfd at the top of the canopy. Be sure to use the correct mil paper as a diffuser. Intensity for flower is generally 800 to 1000ppfd. Depending where youve been running your light, you may need to gradually increase your intensity.
Or you could buy a digital meter
@Metalheadfred I seen a post yesterday someone saying you have to use a diffuser if you have an iPhone. I have never put a piece of paper over my camera but I’m just wondering more about this
For an inexpensive light meter I use this.
It measures in lux. Lux is enough information to do several things. You can find high and low lux recommendations online and in grow journals. You can use the lux reading to balance your canopy and even out the lights.
What you can not do with any meter or ruler is have a setting that is going to be ideal right out of the page. Not going to happen. Lux can keep you in the lane but how fast you drive will depend on environment and nutrition and strain. You will need to look at the plants and adjust lights by what you see.
Is the plant stretching and getting spindly? More light. Is the node spacing close but overall good growth? Back off to induce stretch if that helps. Tips burning and leafs krinkley? Turn it down.
Ya I am a pretty data driven guy and having to learn soft skills like colors and feel and looks was kinda sucky but it just takes some time to learn.
I have seen these two suggested by successfull members here on the forumn but i can’t confirm having never tried them.
I have an android and need to use standard printer paper as a diffuser. Not sure about iphone but they do have instructions on their site. Photone also sells a diffuser that attaches to your phone which id imagine is more accurate.