It is a better light than high pressure sodium. The most efficient type of HID light is the 600-watt HPS that often produces about 90,000 initial lumens upon startup. Manufacturers make most metal halide lamps in two color temperatures, 3000K which appears slightly yellowish, and 4000k which appears brighter white. MH grow lights (metal halide) are suited best for vegetative growth and HPS grow lights are superior for flowering. The MH spectrum contains plenty of blue light, which is critical for avoiding extension growth and increasing leafing; the HPS spectrum is red-dominant, making it perfect for flowering. These lighting systems and bulbs supply a totally different light spectrum for your cannabis plants.. The standard protocol has been to switch from a cool-colored metal-halide (MH) spectrum for vegetative growth to a warm-colored HPS spectrum for flowering. Ironically, most HID grow light enthusiasts recommend using both MH and HPS grow lights. HPS (High-Pressure Sodium) produces a red-orange spectrum of light which simulates the autumn harvest. Ceramic Metal Halide; Ceramic HPS; Double Ended Ceramic HPS; Ceramic HPS™ Lamp Ballast Kit; T5 Fluorescent. Jump up to 150 watt if you want a 400 watt metal halide replacement. A good tennis court lighting system should provide a good amount of lighting for both the players and spectators. 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. 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!! Use a m etal halide lamp (MH) for the first two to three weeks of flower, then switch to HPS. 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. 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. CRI for LED is dependent on the particular light in question. Thanks for any input! It is an easy switch to ceramic HPS if you have a digital ballast, just replace your MH and HPS bulbs with a ceramic HPS one. 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. It is a type of Metal Halide bulb that is constructed with ceramic like an HPS. In fact, after 20,000 hours of use, an MH bulb will have depreciated twice as much as an HPS bulb. BLUE Metal Halide; E-Start Metal Halide; Standard Metal Halide; Dual Arc; Systems. Use a ratio of 2 Metal Halide lights to 1 HPS light for maximum yield. Our 120 watt is an ideal replacement for 400 watt metal halide. However, the orange HPS (identical to street light) HPS spectrum is defective so that it produces unnatural lanky growth. 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. If your HPS bulb has an expanded blue spectrum it can be used start to finish and will provide good results. 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. With autoflowers, at what point do you switch from metal halide to high pressure sodium lights? The initial higher investment in the LED light pays off very quickly. However, unlike LEDs, metal halide bulbs suffer from fast and immediate lumen degradation. Also keep it on veg nutes, then once vertical growth stops switch to the HPS light and to bloom nutes at the same time. 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. So a good strategy is to start under metal halide until the plant is nearly fully grown. ... 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. ! 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