It allows you to give your plants usable light in the blue wavelength (450-495 nanometers) to boost their growth in the vegetative phase. With low heat generation and light output equivalent to 130 watts of traditional incandescent grow lights, they are ideal for supplemental light. To promote thicker and sturdier branches set up several powerPAR led grow bulbs pointing into the lower canopy. The energy consumption of these bulbs is low, and their service life very long 50,000 hours making them cost-effective for supplemental lighting applications. And they fit into a standard incandescent light socket, making them easy to set up with a common spotlight, work light, and other fixture types.