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The Grower’s Choice 315w CMH/LEC Lamps are suitable for use in all standard 315w CMH/LEC 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. This bulb contains precision gasses for an enhanced spectral output. It also generates less heat than HPS and MH. The 3K-R 315W Single Ended CMH more closely matches sunlight than any other lighting solution available. Growers report tighter inter-nodal spacing and better yields on flowering plants. 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 Color: 3000K Type: SE-CMH Wattage: 315W Initial Par: 540 umol/s CRI: 90 Hours: 15,000