Hi @Baudelaire, don't know about putting anyone to shame but apart from that, Cola pretty much nailed it. I went for 10cm spacing on my 5 SolStick rigs which are 55cm each in length. The 9 SolStrip rig i built for my mrs is 95cm long and they are 9cm apart on that rig. Much closer than that and they heat each other up. More strips running at lower power gets the best results. Plants can grow right up to them and still be properly illuminated unlike with cobs, which was our biggest problem with them. A
Edit, aye that 240W driver is running her 9 strip rig with a draw of 260W from our 240V mains.