FarmerDaniel said:

Lux is designed for measuring light for human use. Commercial buildings and such. Here's a crash course for your googling adventures.

You want to measure and talk in terms of PAR not lux. Photons are measured in moles per day and micromoles per second. The DLI is daily light integral. Cannabis wants a DLI between 22 and 65 moles. That's 22 million micromoles. PAR meters measure micromoles. Some general guidelines are usually said like this:

200 PAR for clones and seedlings
400 PAR for veg
800-1500 PAR for flower

Understand that the DLI is for a 24 hour period so if you're running 24 hours at 400 vs 12 hours at 800 your ate delivering the exact same daily light integral.

Lux meters will not get you the information you want. It will weight greens and yellows more heavily than blues and reds so it will not show you accurate growing power

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FarmerDaniel said:

Well two different lights could each show 50,000 but read completely different PAR ratings so it's hard to say.

At least you can know what you're reading when your lights are at a certain height. Then you can use that for future reference just to know how current intensity compares to yesterday's and the day before. So it's better than nothing to have a lux meter but leaves a lot to be desired in terms of actually telling you what you're giving your plants. I know I'm pretty close to 30 moles at canopy right now because I'm running 460 par for 18 hours. 460*60*60*18=29,808,000 moles. Before I had the meter i had no idea how much par changes from just a half inch. I was always guessing. Sometimes running my plants too hard and sometimes not nearly as hard as I could. If you want to maximize get a par meter.

I use the Apogee mq500. It's sensor is calibrated for reading leds better.

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Cannabisvalleyfarms said:

Hey guys. So at 20% im getting 1800 lux. Is that bad or good?

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