Actually the marshydro 300 is 184 true watts. I have a few of them and they work great. I only use one until I see the first pre-flowers then kick on both. When you go into flower you almost have to double your lights to get a really good yield. You just have to make sure you have enough plant to absorb the light or it may bleach or wilt your lady from too much light. I love growing with LED! The light penetration straight up smokes any HPS or MH. i have ever owned. Nugg's out!