... said their lamps have 10% more lumen output than standard HPS,contain a wider blue spectrum, 30% ... HPS, red and blue lights are less than grow light, green light nearly 7-9 times ... bulbs:Normal China HPS: Wrong spectrum, lumen more than 140000LM is OK.Philips green master : right spectrum, ... real grow light, but high price.Our bulbs: better spectrum than Philips, low lumen, still need to improve. ...