https://growace.com/blog/why-is-par-rating-a-big-deal-for-indoor-grow-light-systems/

Jun 20, 2017 ... par meter led grow lights par testing grow tent. PPF stands for Photosynthetic Photon Flux, which means how many photons of light per second ...

https://www.lumigrow.com/demystifying-lumens-lux-and-par/

LED lights require new thinking about the way we measure light spectrum for use by plants. The typical rating most growers are familiar with is the “lumen.

https://lumicrest.com/par-mean/

PAR stands for Parabolic Anodized Reflector. What's that? Many halogen spot and flood lights use a parabolic (U-shaped) reflector to collect and reflect the light  ...

https://advancedledlights.com/blog/technology/lumens-vs-par-grow-test-led-grow-light-technology/

Nov 4, 2010 ... LED Grow Lights – Lumens vs PAR Test (Ongoing). Before we begin, please answer the following question: Which light do you would think is ...

https://www.blackdogled.com/faq_par

Black Dog LED provides all the information you need to know regarding PAR lighting and measurements. See how PAR is important in comparing grow lights.