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HID lamps are categorized in three groups :Mercury Vapor , Metal Halide, and Pressurized Sodium. For plant cultivation, Metal Halide (MH) or Pressurized Sodium (HPS and LPS) are the ones commonly used in grow rooms.Mercury Vapor - Mercury Vapor lamps are common, but they are not the most energy efficient for lighting plants or anything else. Mercury Vapor lamps have an average life of 24,000 hours. A black coating that deposits it's self on the inside of the bulb decrease light output after a significant amount of use. Pressurized Sodium: The life of the HPS and LPS are the same as the Mercury Vapor, however, the energy requirements (wattage) is about half. HPS lamps are usually chosen for outside or warehouse applications where color is not important, and where instant lighting is not required. When Pressurized Sodium lights are used in plant applications, they are commonly used only during the plant's flowering phase. Pressurized Sodium spectrum is more suitable for flowering plants than Metal Halide or Fluorescent lamps. Plants grown under Pressurized Sodium lamps yields larger, denser fruits and flowers. Metal Halide: Metal Halide lamps are usually used during a plant's growth phase because its spectrum provides good growth rate and smaller compact plants. Metal Halide Lamps provide high system efficiency (up to 100 lumens/watt) compared to Mercury Vapor, fluorescent and incandescent lights. Metal Halide have a "white" color which makes a good approximation for daylight. Metal Halide lamps last for 10,000 to 15,000 hours. Metal Halide lamps have a shorter lifetime than high pressure sodium lamps. Metal Halide lamps, however, have a shorter lifetime than high pressure sodium lamps. Golf Options: Hit Fairways Your Way. - New Golf System that Explains How Setup and Swing Factors Affect Ball Flight and Solutions to Common Golf Problems. Fund Your Flying. - Special Report that tells new and old pilots how they can fund their flight training for pennies on the dollar. Article Index: | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 24 | 25 | 26 | 27 | 28 | 29 | 30 | 31 | 32 | 33 |
More Articles:1. The Protea Family (Proteaceae) By Geoff Bryant The protea family (Proteaceae) includes a wide range of ground covers, trees and shrubs that often make superb garden plants. While some of the species are frost-tender, they are in all other respects remarkably resilient plants that often thrive in situations where others would rapidly succumb. Poor soils and hot dry positions that scarcely seem capable of supporting life are often ideal for Proteaceae. If any plants could be said to thrive on neglect the proteas can. Proteas (the term i… 2. Blue Flowers Add Style and Color to Any Garden By David Chandler Blue flowers are some of the most striking plants around and can add a rich splash of color to any garden. Plant them in a cluster of all blue or mix them in with other flowers for a rainbow of color.When planting flowers, it is important to remember to follow the instructions on the tag for the plant. Always buy plants that will thrive in the conditions in which you intend to grow them. A plant that loves sun will not do well in a shady area and you will only be disappointed with the resul… 3. How to Control Poison Ivy By Marilyn Pokorney Poison ivy is found throughout southern Canada and most of the United States except Alaska and Hawaii. It is readily found along road sides, fences, railroads, and streams. But it can also be found in your own back yard. It is planted there in bird droppings from the birds who eat the berries of the plant.So how does one get rid of the rash producing plant? Here are some tips:* Poison Ivy control is most effective May through July while the plants are flowering.* Pulling out the plant … 4. Cannibals on the Porch By Jim Burnell No, ghosts of the Donner Party have not started haunting my porch, nor have others of the human type I may have reference to. I am speaking of cannibals in the insect world of which there are many, but two in particuIar that make me stop and wonder. The first is waxy black with a small red hourglass on her abdomen. She dangles on a thin thread late on warm summer nights in doorways or dark corners waiting for the what ever comes her way. I am sure you guessed, it is the female black widow s… |
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