In general no, because the extra heat produced would make it a fire hazard.
Yes, you can run a 400-watt metal halide (MH) bulb in a 600-watt high-pressure sodium (HPS) fixture, but you need to ensure that the ballast is compatible with the MH bulb. Using a 400-watt MH bulb in a 600-watt ballast may lead to reduced efficiency, as the ballast will deliver more power than the bulb requires. It's essential to check the ballast type and ensure that it can operate both bulb types safely. If not compatible, it's best to use the appropriate ballast for the MH bulb to avoid damaging the bulb or the fixture.
About 150 watts.
A 250-watt HPS (High Pressure Sodium) bulb typically produces around 28,000 lumens at the initial phase of operation. However, this can decrease over time as the bulb ages.
100 Volts
In most cases a cfl bulb can be replaced with an incandescent bulb as long as the base matches. for an example: if a cfl bulb has a GU24 base an incandescent bulb will not work! Also, ensure the wattage of the bulb does not exceed manufacturers rating.
No high pressure lbs require a specific ballasts to operate the bulb correctly
Not recommended. It would work but shorten lamp life and may cause risk of fire. However, if you just wanted to check a lamp was capable of striking it would be ok for a few minutes. I've done the opposite in the past and used a 150w lamp with a 100w ballast. Works, but not good for any of the components, including lamp.
If the ballast of the HPS fixture has a 120 volt tap then, yes it can be plugged into a 120 volt receptacle.
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.
A 250W HPS (High-Pressure Sodium) bulb uses 250 Watts of electricity when it is operating at its full power. It is important to note that the actual power consumption may vary slightly due to factors such as ballast efficiency and voltage fluctuations.
One can buy 1000 watt HPS bulbs through the better known webshops like Amazon or eBay. 1000 watt HPS bulbs are most often just to grow specific plants at home.
A ballast typically uses around 5-10 watts of power. In this case, a 150 watt HPS bulb will consume 150 watts of power when turned on. So, in total, the ballast and the bulb together will use around 155-160 watts.