Philips 315W CMH Lamp produce very high quality light for the plants. They have a very high CRI, which means the light they produce mimics the quality of sunlight. A great deal of that light produced is in the PAR spectrum.
And one more thing about CMH light spectrum, since it’s a complete spectrum. You’ll be able to see the plants clearly, without using color adjusting grow room glasses. But if you’re growing with LED grow lights, you’ll probably benefit from using grow….
On the other hand, Light Emitting Diodes (LEDs) produce light in a specific, and narrow, wavelength. The hundreds or thousands of diodes are not replaceable.