seedlings 300 par not enuff?

If you don't have a light meter judge how much distance their is between the nodes. If its a lot. light needs to be more, if its little to none light needs to be lesser. Dim setting vs promixety of the light to canopy are two options for giving more or less. moving the light will alter the hotspots on the PPFD map dimming it will not. look up your lights make and model and see if the brand has any PPFD maps for it. You can easily calculate PPFD or DLI using light maps for you own tent size if its not the same. little definition from google; Photosynthetically active radiation (PAR) is light of wavelengths 400-700 nm and is the portion of the light spectrum utilized by plants for photosynthesis. Photosynthetic photon flux density (PPFD) is defined as the photon flux density of PAR. Its also good to note that PAR is an outdated term and its showen that plants use waivelengths outside of the 400-700nm range. its commonly called ePAR or Extended Photosynthetically active radiation. There is a guy on youtube who explains this quite well called Dr.BruceBugbee, Look him up for more information.

Par is different than ppf/ppfd guys.. Get a photomontage app. Using 1. Take the highest lux on your phone. Take the lights rated strength. (If its 1000ppfd you want 45% of the lux to be hitting the top of your canopy at 45cm. P.. dont take the distance into account. Just get its max rated power so if the light has a power rating for 45cm great but ppf is ppf. So just make sure you're hitting that. Here's a link explaining a lil. Very basic stuff guys. https://lightsciencetech.com/what-are-par-ppf-and-ppfd-and-why-should-you-care/

If you are at 300 and they continue to stretch then slowly go up to roughly 400. I’ve topped off mine around 450 PAR at week 2 and they didn’t care as long as they have a good growing environment.