The Grower’s Choice 315w CMH Lamps are suitable for use in all standard 315w CMH fixtures. The 3K-R is an enhanced version of our 3K lamp that is designed specifically for plants that are prized for their resin production. It is similar to the original 3K, but it has contains a few subtle differences.

• A slight increase in UV light to promote resin production

• A taller peak in the Far-red to stimulate metabolic activity during flowering

• Slightly higher PAR for better flower density

• Increased intensity in red