To answer this question a voltage needs to be stated. The formula needed to find the amperage is I = W/E. Amps = Watts/Voltage. Once the amperage is found, the proper size conductor to handle that current can be established. Without knowing the amperage on 400 watts a good guess would be a #14 wire. This wire size is good up to 1440 watts at 120 volts.
This is a voltage drop question. To answer this question a voltage has to be stated. Amps = Watts/Volts. Without this value the question can not be answered.
You need to look at the regulations that apply in your country. If in doubt, use a neutral wire of the same size as the live wire or wires.
It will power two 400 watt lamps.
Depends on the size of the sub-panel in that garage. If you are installing a 60 amp sub-panel 400 feet away from the main service panel then use AWG # 4.
The key parameter in sizing wire is the current requirement. Once you know that you can look up value in a wire gauge table. The length of the run is important for longer runs because of the resistance of the wire itself. Aluminum wire requires a larger diameter than copper for the same current. Once you calculate the wire size you can then size the conduit.
500mcm 37 strand copper wire = 1.544lbs/ft.
You need to look at the regulations that apply in your country. If in doubt, use a neutral wire of the same size as the live wire or wires.
It will power two 400 watt lamps.
1 Joule is 1 Watt-Second. 1 Watt Hour is 3600 Watt-Second or 3600 Joules. 400 Watt-Hours is 1440000 Joules.
Four 100 watt light bulbs or anything else that sums to 400 watts.
From halogen to LED you can divide by 4 to find the equivalent. Therefore an 80 watt LED would do the job.
Per hour the answer is 400 watt-hours or 0.4 kW-hours (or units).
For a 430 watt high pressure sodium bulb, you would typically need a ballast that is rated for 400-430 watts to properly operate the bulb. It is important to match the wattage of the bulb with the wattage rating of the ballast to ensure optimal performance and lifespan of the bulb.
I would wire them together in a parellel circut. all the lights together, white to white black to black then put your ballast to em. it works like that with my 400 watt mh/hps ballast and 2 250 watt hps bulbs. run 2 hps bulbs with 2 mh bulbs if you can, you get better results.
It will, but only 1.75 decibels louder. The smallest change in loudness that most people can detect is 1 decibel, so the difference between 400 and 600 watts would be barely noticeable.
The solar component for a 10 watt system can be had for under $400 USD.
800 watt should be fine
ummm...4(?) is this a trick question?