That is confusing??
I did read somewhere that LED's and light meters don't like each other and it may have something to do with this. Put your camera in slo mo and film your lights. Older style leds, like the CF grow Cl-252 red and blue I just purchased will flicker, my Cobs do not, so either their refresh rate is much higher, or they fade slower when off, like an incandescent bulb does. So a fast digital meter may be expecting steady state light but is now reading when the led is off and is averaging the two states and giving a false reading. Just speculating....
Room Ied's did this when they first came out as they were using line frequency for a clock, but that has been taken digitally to high speeds and is not filmable with an iphone.
What distance from the light are your tips? I also test at the tips, which I usually keep 20 inches from the light. My HPS is rated at 90,000 initial lumens. And there is also a 100 W 3590 Cree Cob in there.
Here is a link to a converter site, the interesting thing is how the ppfd to lux conversion changes depending on the light selected.
Convert PPFD to Lux - Online Calculator | Waveform Lighting
I test at tips, best use of light is to create a flat, even top for min photon wastage...
Evefy thpe of light has a diff lux to ppfd conversion factor...
Actually, that is a hps that has been colour corrected in photoshop. You can tell because the pistols are almost impossible to correct to white. Here is a good sample of the light from a cob only. Once these gals start flowering I will do some close ups. I added a cob to my pix in my earlier post today, and turned down the hps to get a little better light. Still did some corrections though. Looking at the lowest flower that is shaded from the HPS, you can see the effect of the much whiter CobThat color, that is the full spectrum cobs right
Good looking plant, I love those deeply serrated leaves!