Yes, at that point your right. At the old days when we don't have par meters, we also only test with lumen, but usually good chips are with higher lumens and par as well. So it can be used for reference.we know that Sara, but not everyone can buy a PAR meter, that just converts LUX anyways, its a big LED community scam. I have done tests to confirm this also, so its not just me talking crap, PAR is great for the producers of the light for a Selling Point, but in little home grows, Lux meters work just fine, staying with the notion that LED growers burn their plants because they give them to much light, and thats a fact.
Intensity is intensity regardless of light, and Both the $153 PAR meter and the $30 Lux meter is just the same, The Lux degrades with distance, as does the PAR meter, at the same rate.
|Vegetative||70,000 lux||40,000 lux||15,000 lux|
|Flowering||85,000 lux||60,000 lux||35,000 lux|
. It's PPFD, by the way, not PPDF. We understand what you mean, but if you ever feel the need to do a web-search for information, getting the letters' order correct might save you some time.This pic is from weeks ago and it shows ppdf around 900. That was my sweet spot for early on in flower. They are weeks past that now and I have my lights close enough to get about 1050 ppdf.
Here is a pic of the meter I use
Nice meter, Apogee makes good ones. Be sure to check the manufacturer's website to see if a firmware update is available, as they do occasionally release updated code. For example, I was reading some related information at a reefer (salt-water coral enthusiast) website one day and saw where someone had tested several popular PAR meters against a very expensive meter that was known to be accurate and calibrated, something that some of the companies use for testing/R&D I think. Anyway, the person discovered an issue with a couple of meters, one of which was an Apogee. He contacted the manufacturers with his findings and was contacted back by someone at Apogee a week or so later; the person stated that they had just updated the firmware for that particular model and invited him to test it (problem was fixed). I consider that a good indicator that it's a decent company... Far better than when many people report an issue to a company and they only end up quietly releasing a fix a year later (if at all), IMHO.