HPS: 56,000 Initial Lumens; MH: 36,000 Initial Lumens- High Lumens- Longer Life Span. HPS: 2070K Color Temperature- Optimal Flowering Spectrum; MH: 6400K Color Temperature- Optimal Vegetative Spectrum.
HPS: 22.5 CRI; MH: 75 CRI- High Color Rendering Index. Recommended Use: With 400 Watt ballast, 12"-24" above plants, covering a 4'x4' grow area, during vegetative & flowering cycle. The ARC High Pressure Sodium (HPS) Bulbs produce a very balanced and efficient light spectrum created specifically for flowering, budding, and fruiting.The HPS bulb is designed to mimic natural summer sunlight, and are among the most energy efficient sources of indoor artificial sunlight available. ARC HPS bulbs stimulate flower and fruit production efficiently and are recommended during flowering cycles, but can also be used during the vegetative cycle of plant growth. A metal-halide lamp is an electric light that produces light by an electric arc through a gaseous mixture of vaporized mercury and metal halides (compounds of metals with bromine or iodine). They are members of the high-intensity discharge (HID) family of gas discharge lamps. Developed in the 1960s, they are similar to mercury vapor lamps, but contain additional metal compounds in the arc tube, which improve the efficiency and color rendition (whiteness) of the light. Metal-halide lamps have high luminous efficacy of around 75 - 100 lumen per watt average, about twice the efficiency of mercury vapor lights and 3 to 5 times that of incandescent lights. They have moderate bulb life (6,000 to 15,000 hours, a little shorter than mercury lamps) and produce an intense white light. The lamps consist of a small fused quartz or ceramic arc tube which contains the gases and the arc, enclosed inside a larger glass bulb which has a coating to filter out the ultraviolet light produced. Like other HID lamps, they operate under high pressure (4 to 20 atmospheres) and require special fixtures, such as electrical ballasts to operate safely. They also require a warm-up period of several minutes to reach full light output. The ARC Metal Halide (MH) bulbs are perfect for indoor gardening with excellent spectral distribution. ARC Metal Halide bulbs are recommended for use during your plants vegetative growth cycle. The item "6PC- ARC 400 Watt MH & HPS Grow Bulb/Light/Lamp for Hydroponics" is in sale since Friday, July 13, 2018. This item is in the category "Home & Garden\Yard, Garden & Outdoor Living\Other Yard, Garden & Outdoor".
The seller is "chibster08" and is located in Arcadia, California. This item can be shipped to United States.