Lighting COB vs Quantum board type lights

[jaywillin]

PAR meters can be rented from Aquarium stores online for around $60 for a week. I rented one and took measurements at 36/24/18/12/6 but I found 12 inches to be optimal. My LUX readings were not consistent with the calculator below when compared to the PAR meter

Convert Lumens to PPF - Online Calculator | Waveform Lighting

Online calculator to convert luminous flux (lumens) to PPF (micromoles per second).

www.waveformlighting.com

I used the link below to build my first lights at 75% efficiency. Most of the stuff on that list can be sourced for cheaper and aluminum heatsink is unnecessary and expensive compared to T slot or C channel.

DIY LED Strip Build Designs for Samsung H-Series, F-Series, Q-Series, and Bridgelux EB Gen.2 - LED Gardener

DIY LED strip builds have become very popular recently. The mid-power section of our forum is full of threads created by DIYers looking to build their own custom lights, and new builds and ideas are surfacing every day. If you don’t live somewhere where you have easy access to premade lights...

ledgardener.com

Even if you add the factor in the issue is that CRI can skew the results so 10k lumens isn't the same across different lights as lumens is for humans. Spectrometer will get you the below results

Those are from a buddy that owns a spectrometer. He is led_teknik on IG
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great info, thanks !