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 the 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.

Grower's Choice 3000K 315 Watt SE CMH Bulb Features

• 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

Specifications

• Spectrum: 3000K - ideal for bloom
• Lumens Per Watt: 110
• CRI: 90
• Lumens At 100 Hours: 33000
• Photon Flux: 540 umol/s
• Lifespan: 15,000 hours

See the full spec sheet here.