ChubbyBudBros

<span class="link_user">@ChubbyBudBros</span>, good to know my diary checks out! That&#039;s what I like about GrowD, that we can check on each other&#039;s grows. I checked your diary too and indeed, I noticed the air temperature was 29°C! What was the PPFD during that time? I reckon 35-40cm would only give about 400 PPFD on the canopy?

<span class="link_user">@DutchBarnacle</span>, Yeah the PPFD was only like ~550 at the top buds, so lower was probably around 400 indeed, didn&#039;t get any dense buds at all, but learned a lot for a first grow! Lesson learned that I will never be growing in the summer again :smile: FYI, if you want there is an RQS official Discord that&#039;s pretty active if you wanna join that, lots of people helping each other out.

<span class="link_user">@ChubbyBudBros</span>, that&#039;s a great comment, thanks! About 15cm indeed, it variaties between 15 to max 30cm in bloom. There&#039;s &#039;only&#039; 80 watts shining down on the highest budsites, culminating to about 950 PPFD. That drops down to 600 PPFD about 15 more cm down. Auto&#039;s can take incredible amounts of light and - to my knowledge - the main reason for leaf burn is not light intensity but rather temperature. Since it&#039;s turning winter here, temperatures outside the tent are dropping, providing a steady stream of cooled air between light and canopy. With its max output of 100 watt, the SF-1000 has proven unlikely to burn the plants I&#039;ve grown with it so far. If I&#039;d be running an SF-4000, it would permanently be at the top of the tent.

<span class="link_user">@DutchBarnacle</span>, wow super interesting thanks, I didn&#039;t know that if the temps stay low enough it can actually manage such a close distance. I see now that your day time temp says 22°C, so that makes sense then. If you look at the purplematic diary on my profile, you&#039;ll see towards the end my plant was having bad leaf burn from the SF1000 at like 35-40cm&#039;s high. But it was middle of the summer with temps reaching 27-29°C in the tent consistantly.