Iodine and chlorine.
A metal halide ballast works just by transforming the line voltage into much more useful voltage to the metal halide, and by regulating the current so that the bulb will have its useful life at the most.
No. The lamp has to match the ballast. The lamp will not ignite if the wrong ballast is used.
Yes. However it would be recommended that you use a metal halide bulb that is specially made for indoor horticulture.
No, metal halide and mercury vapor lamps do not use the same ballast. Metal halide lamps require a ballast specifically designed for metal halide lamps, while mercury vapor lamps require a ballast designed for mercury vapor lamps. Using the wrong ballast can result in poor performance and potential safety hazards.
Yes, iodine is a halogen element and therefore classified as a halide.
No. A 70 Watt metal halide bulb can not be replaced with a 150 Watt halide bulb.
The question isn't what you're powering with a particular gauge of wire, but what's the current draw. If the metal halide light can run on a 15 Amp breaker (from the breaker panel), fine use your metal halide in your residential application and run it on the 14 gauge wire.
No, it is not recommended to run a 50 watt halide bulb on a 100 watt halide ballast. The ballast should match the wattage of the bulb to ensure proper operation and to avoid potential damage to the bulb and ballast. It is best to use a ballast that is rated for the wattage of the bulb being used.
Yes
To grow marijuana in the vegetative stage. HPS for flowering
Yes the ballast and starter are the same you can run halide in hps, but not hps in halide.
No, the ballast has to be matched to the lamp. 250 watt ballast, 250 watt lamp. Also be sure to match the lamp type to the proper ballast even though the wattage is the same. HPS ballast to HPS lamp, Metal halide ballast to metal halide lamp and mercury vapour lamp to mercury vapour ballast.