The lights you mention will do fine. They are overkill for a 3x3, but they have dimming. 30 watts per square foot is good with quality LED, so about 270w for a 3x3. HLG is much better quality than Spider.
For DIY, I'd do a strip build or maybe boards.
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
Now comes a long discussion of which strips/boards.
I'd look into Bridgelux Vesta strips, cutter strips or boards from growlightsaustralia.com, and there are many others.
The Vesta strips have two rows of LEDs, each with a different color temperature. Use more blue for veg and and more red for flower.
As for 30% higher efficiency, i believe i said at 660w over a 4x4 but could be mistaken . You said: "The Bar-8 has a 1730 ppf dude. 2.8 UMOL/J set to 660w. 2.7 (2.689) @ 900w." OK, how is 2.8 30% higher than 2.6? And how much higher would the efficacy of the HLG be if dimmed the...
www.rollitup.org
Order today, ships today. BXEB-TL-2750G-3000-A-13 – LED Lighting COBs Engines Modules LED Module series White, Warm / White, Cool Linear Light Strip from Bridgelux. Pricing and Availability on millions of electronic components from Digi-Key Electronics.
www.digikey.com
Some links to start getting familiar....
Newbie here, looking to set up a 3x3x6 tent & need advise on what would be the proper led lighting to use to get the maximum potential out of the tent. Been looking at HGL & Spider Farmer & just cant figure out how many / what size to use. Will be my first grow & want to try to get the right...
www.rollitup.org
Ok I have caught the led grow bug, spent many hours reading about LED strips here, have some technical brain cells (but still make mistakes !) and have come up with a plan for a new grow room lighting. Here is a background on the room and what I am proposing to do. I just got done building a 2...
www.rollitup.org
i rebuilded my striplight, containing 56 EB3 slim bridgelux strips, 3000k 80cri. Killed some connectors during this action, their release mechanism can be a pain. Anyway, it works! The new frame is 80x80cm (31,5x31,5 inch) 20x20 t-slot profile, hung on all 4 corners. Its for a 3x3 and/or a...
www.rollitup.org