Overview Reviews Product Description The Pro Grow 4k Metal Hallide turns a std 2k hps system into a 4k metal Hallide system by just changing the lamp .This give you alot higher CRI providing a better spectrum for plant growth than your standard 2k Hps lamp would . Product Videos Product Reviews Write a Review Write a Review × Pro Grow 4K Metal Halide 600w DE Lamp Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Email * Review Subject * Comments *