Well I was a bit confused....I have a 430 watt with an as of yet unused Son agro....grow room should be finished by the end of this weekend. To hot last week to do shit...anyway I already purchased a 430 hortilux HPS. Now the funny thing and this was from the guy at the hydro shop...said the 400 BLUE HORTILUX for MH was better for overall plant growth and flower. Not sure if he was right or wrong but it did make me wonder if I should switch out my MH light. Let me know what you guys think....less Lumens I know...but the graph did make it look appealing....and they even compared it to the HPS hortilux...much broader spectrum