This is my second bulb, I've done 3-4 grows with it. my plants to get tall, even after switching the cycle they can grow another 1-2 feet easily. I don't have an HPS light but supposedly the hortilux blue casts a bit of red spectrum too. Note, i didn't use the hotilux through all of my last project but MH instead... so... maybe things would change on this next one. But from what i am gathering from everyone, it is a matter of lighting?
And or spectrum?