I've been researching a good amount on LED grow lights. I'm familiar with the importance of 3W min chips vs 1W and 2W. I'm familiar with the spectrum and which bands to look for. The light I'm about to purchase is the 240W Blackstar LED Panel for my 3-4 plant scrog grow. I just have a few concerns I need cleared up. Is the small lense over the LEDs found in the more expensive systems really necessary? Does it aid in light penetration or just make the footprint larger? Why does Blackstar charge about $280 for a 240W panel and Advanced is $540 for only 180W? I don't want to be disappointed with the quality of the final product as that's what this is all for... but doubling start-up costs is pretty tough too. What do you all think?