Just to clarify like many people before... a Blackstar 240w draws an actual 140w and when planning space covering needs to be treated as a 140w LED.http://www.gothamhydroponics.com/grow-lights/gotham-hydro-led-grow-lights/blackstar-240w-led-grow-light-3w-cree.html
Its a 240 W panel, ( Gen 7?) supposedly using 3W crees with mix of 60 and 120 degree for optimal penetration with 11 spectra but mostly the reds- I'm sure you can read their page. Says it will cover 4-6 sq ft and at $260 per looks a bit cheaper than the 357. May give it a shot and see what happens. Will probably keep UFos going too.
About to change the res out today. Flushing right now with reskleen Looks like I'm getting either Potasium def or nute burn with this trouble I have been having keeping pH down. Seeing tips browning on lower leaves and some spottting. I have been spraying with res water so that might have done it too. PPM is up to 1500 with all the damn pH down I have had to add with a little tap in the mix from my softener. Going to a 40ppm mix of DI and Poland Springs this am. Have it sitting and waiting to go at pH 5.8. Will add 400 pmm of the famous moon dust and 200 ppm of B-52 and see how they do. Have gotten some algea in tank and on starter plugs. Pulled all my non- starters and will cover up the unused pots with foil to block light in res- water isnt green though so I take that as a plus- just on sides on tank. Still on a 24 hr veg and my widows are thriving as are the two carms under the two 90w ufos.
When the companies say there base coverage area (4-6 feet in this case) it's at best for vegging. I'm not trying to call Lighthouse "liars" because almost all companies do similar inflated "w ratings", but it definetely is something to take in to account when pricing.
From what my understanding from many of the successfull LED grow through to harvest is that about %40-%50 wattage of HID needs to be used in LED's to do similar outputs... and also more success has been had using several smaller units as opposed to fewer larger... say 2 200w's having better results than 1 450w LED for example, but thats allways been the same case when I came to HID as well (600's over 1000's).