The Aerogarden™ Pro 100 introduces new and improved technology called Adaptive Growth! The basic model regulates nutrients and light to optimize growth for each specific plant type. AeroGrow's stainless steel Pro 100 uses computerized Adaptive Growth technology to continuously monitor plant growth and instantly adjust the nutrients, light cycle and water flow to give plants exactly what's needed at each stage of growth - for earlier harvests and up to 50% more food. From germination, to initial growth to advanced growth, we are delivering just what the plant needs, just at the right time. In addition, since grow lights lose power over time before they actually burn out, it is important to replace your bulbs every 6 months. The Pro 100 includes a Grow Light Replacement System, to automatically remind consumers when it is time to replace the lights for continued optimal plant health and growth. The Pro 100 Super Grow 24 hour light cycle lets the experienced gardner override the built-in timer, which is maximized at 17 hours of light, to provide more light. This expands the possibilities for gardeners who may want to plant their own seeds in conjunction with the Master Gardner Kit.