Metal Halide lamps should be changed at least every 6 to 12 months if you're burning them 18 hours per day. High Pressure Sodium bulbs, burned at 12 hours per day, will last between 6 months and a year and a half depending on the bulb. See similar questions...

The difference between these two types of HID (High Intensity Discharge) lights is the color spectrum that is emitted from each. The High Pressure Sodium bulb emits light that is concentrated in the red to yellow side of the spectrum and are weak in the blue-violet end. While the Metal Halide bulb emits light that is very balanced and contains all the energy peaks at wavelengths of the visible spectrum. See similar questions...

Yes you can. You will need to change out the ballast, capacitor, ignitor and lamp. However, there are several cautions that must be taken: the metal halide wattage must be within the fixture limitations; the socket position may need adjustment; the reflector may be different or the ballast strapping may not fit properly. Please contact the factory for a specific product. See similar questions...

First, what type of natural light are you working with? When supplementing natural sunlight, use a High Pressure Sodium bulb to extend daylight in the early spring and fall. You can also use them on low light cloudy days. When no natural light is available at all, a Metal Halide bulb is most frequently used, , which is a very wide spectrum bulb perfect for indoor growing. Halide lights are excellent for vegetative growth for leafy plants like lettuce and basil. See similar questions...

Although both types of lighting systems appear very similar, the main difference becomes readily apparent when you turn them on. A Halide system emits a balanced white light similar to the spectrum of sunlight. This type of light promotes vegetative growth. A Sodium system emits a light spectrum and gives off a warmer colored light. This type of light helps stimulate a plant to produce flowers and fruit. See similar questions...

In our controlled trials, we found that High Pressure Sodium (versus Metal Halide) when used for an entire crop cycle, slightly but noticeably out performed Metal Halide. We have also found that High Pressure Sodium gives a marginally better yield if it used for the bloom phase and the Metal Halide performs slightly better during growth. Our results would not justify purchasing both the lights for growth and bloom but this may not be the case with all species and strains. See similar questions...

There are a couple of reasons growers switch between bulbs during different stages of plant growth. First, Sodium bulbs can make some plants grow "leggy" and stretched out due to the high yellow to red spectrum they give off. Halide bulbs tend to keep plants "tighter", with less space between internodes. See similar questions...

Gallium and multi-spectrum lamps have cooling requirements fairly equivalent to mercury lamps. Special care is required for iron lamps. If an iron lamp overheats, the iron will irreversibly become part of the quartz tube. This will not cause lamp failure but you will lose the iron portion of the UV spectrum. See similar questions...

Most metal halide lamps will not fail this way if operated according to the lamp manufacturer's instructions, but there is always the possibility. The likelihood of a non-passive failure is increased if the lamps are operated round the clock and not powered off at least once a week. The reason that the lamp can fail this way is inherent in their design. The center arc tube is made of quartz. See similar questions...

Many people switch between bulbs for different stages of growth for a couple of reasons. First of all, Sodium bulbs have been known to make some plants grow leggy and stretched out because of the yellow to red spectrum that they give off. Metal Halides tend to keep these plants tighter with less space between internodes. So some growers use the Metal Halide lights during vegetative growth to keep the structural growth of the plant nice and tight. See similar questions...

The ImagePro will physically fit into the Altman Shakespeare, ETC Source Four , Selecon Pacific, and the Strand SL. At the time of this writing, the following options had been tested: Altman Shakespeare CDM 150 – Fine. Normal lifespan of slide. ETC Source Four HID 150 – Fine. Slide lifepsan increase by approx 20%. ETC Source Four MSD 250 – Too hot. Slides burns out. Selecon Pacific MSR 575 – Fine. Normal lifespan of slide. Selecon Pacific 80v - Fine. Normal lifespan of slide. See similar questions...

The hotter the filament the more efficient the lamp. The upper limit to filament temperature is the boiling point of tungsten. High pressure (around 100 PSI!) gas filling raises the boiling point. This allows a higher filament temperature, greater visible light output and increased efficiency. See similar questions...

You may have noticed that our metal halide light kits are more expensive than other models available online. The reason is that our light sources utilize HQI and electronic ballast technology. Less expensive kits use core-and-coil technology, which causes the annoying "buzzing" sound that you are used to in parking lots. See similar questions...

The Halide lights have a very balanced spectrum and are excellent for vegetative growth or leafy plants like lettuce and basil. The Halide lights produce between 65-115 lumens per watt which is a measure of the efficiency of the bulb, or how much light you are producing for the amount of electricity you are using. The Sodium lights produce light that is very bright and concentrated on the yellow to red side of the color spectrum. See similar questions...

Head lice begin their lives as eggs--empty eggs are called "nits."(The word "nitpicking" stems from the time-consuming process of going through a person's hair to remove head lice and their eggs.)Eggs and nits are oval-shaped, tiny and greyish-white, and attach to the hair near the root with a waterproof glue-like substance that cannot be washed out or blown away like dandruff. The female louse may lay over 100 eggs on the hair near the scalp. See similar questions...

egg laid by queen 2. larva hatches and grows through 4 larval developmental stages or instars between which molts of larval skin occur 3. at 4th molt a pupa is produced 4. pupa hatched into adult ant. How the colony feeds and cares for female larvae determines their caste; i.e., whether they behave as workers (all are sterile females) or queens. Male ants develop from unfertilized eggs and therefore possess only one set of chromosomes; i.e. they are haploid. See similar questions...

Usually you can tell when they start to look unhealthy or they are announcing "pick me" by examining the cap (or head) of the morel as well as the base of the stem. You will typically find the morel begin to darken along the stems as well as the cap as it ages. The amount of discoloration is a good indication as to if the morel is on the down side or not. Slight decay and discoloration is by no means reason to feel failure in your timing as a shoomer. See similar questions...