Apart from metal halide HID’s, this is another variety of HID’s called High-Pressure Sodium (HPS).). Metal halide offers CRI from 60-90 depending on the type with med 60s to low 70s common for parking lot type. LED. From the instant you first flip the switch, the bulb becomes less and less bright. Hey Joe, lots of folks switch around day 10, now would be fine, some even switch back to metal halide the last 10 days or so before harvest. Jump up to 150 watt if you want a 400 watt metal halide replacement. However, unlike LEDs, metal halide bulbs suffer from fast and immediate lumen degradation. ... and every time you switch on your HPS light the metal at both ends of the arc tube gets a considerable amount of shock by heating up from room temperature to the operational heat. but the pamphlet that came with the HPS grow light estmates about a $25 cost to run the light 12 hours per day,which doesnt sound too expensive and worth it if the plants grow like mad!! However, the orange HPS (identical to street light) HPS spectrum is defective so that it produces unnatural lanky growth. ! Keep the night (lights-off) temperature cooler but within about 9°F (5°C) of the day temperature. On the other hand, natural white light metal halides produce lush compact growth with lots of leaves. If your HPS bulb has an expanded blue spectrum it can be used start to finish and will provide good results. You can easily replace a 250 watt metal halide with a 60 watt or 80 watt corn bulb and save over 70% off your energy bill. A good tennis court lighting system should provide a good amount of lighting for both the players and spectators. Metal Halide (MH) Grow Lights As a High Intensity Discharge lamp, a Metal Halide grow light operates in a very similar way to an HPS. Metal halide bulbs, sometimes shortened to just “MH” and high pressure sodium bulbs, sometimes shortened to simply “HPS”, are in a family called High Intensity Discharge bulbs, or “HID” for short. Today, mercury vapor has been all but totally phased out in the U.S. and has been largely replaced by metal halide and high pressure sodium (HPS) lamps. Our 120 watt is an ideal replacement for 400 watt metal halide. As plants reach the flowering/fruiting stage the HPS spectrum enhances the quality of fruit and a larger harvest. Quite clear in quality MH. 10, the ground must be reliably connected to earth. Each type of light has strengths and weaknesses. English. In fact, after 20,000 hours of use, an MH bulb will have depreciated twice as much as an HPS bulb. I have heard a few different things on this subject some people have told me wait till all vertical growth has stopped to switch others say it will grow more under hps while flowering. PowerVEG Family; Veg Formula; Flower Formula; Start-to-Finish Formula; Metal Halide. Around its half-life point, you can expect a metal halide bulb to be at 50% capacity. The two best HID lights for indoor gardening are high pressure sodium (HPS) and metal halide (MH). But since you already have the MH bulb I would suggest you use it till vertical growth stops, usually around week 6. Nice plant. Use a m etal halide lamp (MH) for the first two to three weeks of flower, then switch to HPS. Ceramic Metal Halide; Ceramic HPS; Double Ended Ceramic HPS; Ceramic HPS™ Lamp Ballast Kit; T5 Fluorescent. When you buy this, you get one metal halide grow light, one HPS grow light, hanging kits to ensure that you are able to hang your grow lights properly, one reflector hood to enhance the efficiency of your light and to increase the coverage area, a ballast in which these bulbs can fit in – and lastly a programmable timer. How it Works: The lamp uses mercury vapor to create the powerful light (like the high pressure mercury vapor) but includes other metals (halide salts) to improve the color.. A Halide is a chemical compound of a halogen combined with an electropositive element, or in the case of lamps: a metal. Whether you’re interested in replacing or retrofitting your current tennis court light fixtures, there are many benefits to switching from metal halide and HPS to LED tennis lights. As a general rule of thumb, HID grow lights like Metal Halide (MH) and High Pressure Sodium (HPS) are most suitable for relatively larger grows where there is at least 5 feet (1.5 meters) of height in the grow space, though it’s recommended to use a taller space for the best results.This is because MH/HPS lights have to be kept fairly far from the plants. 141 107 28. As a result, LEC grow lights last longer and are 10-20% more electrically efficient than MH lights. Metal Halide ~70-150; Where HPS is better? They also produce relatively high levels of UV rays , which may contribute to increased trichome development on cannabis buds, and can potentially make buds more potent. As plants get to the flowering/fruiting phase the HPS spectrum enriches the quality of fruit plus a bigger crop. ... the midline allowed mounted switch and fuse, and the greater intensity of neutral wire should be used to prevent its disconnected. This is a common compliant for businesses replacing a small portion of metal halide lamps, and mostly is the complaint we receive when the customer or electrician replaced a burnt out lamp. I have read that Metal Halide is better to Veg with than a HPS and I just wanted to put my feelers out there and see what you guys think. Manufacturers make most metal halide lamps in two color temperatures, 3000K which appears slightly yellowish, and 4000k which appears brighter white. 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