When it comes to the DJ world LED DJ Lighting is  lighting using diodes , A Diode is a semiconductor light source that emits light when current flows through it , Electrons in the semiconductor recombine with electron holes, releasing energy in the form of photons. 

Also LED Lights do not get Hot , Rember Halogen Light Bulbs ? Halogen Lighting gets very hot so they are not safe , LED Lighting does not get half as hot in fact kids can even touch LED lights and not burn themselfs  , Halogen Bulbs will very much burn you and can leave A 3 degree burn if not worse unlike LED light bulbs

Efficiency – LEDs require significantly less power to operate than halogen lights. ... Halogen light average about 1500-2000 hours whereas LED light range from 30,000 to 50,000 hours. Energy usage – LEDs require significantly less energy than a halogen to produce the same or higher quality of illumination . 

LED Lights Also are not hot , They can get A little warm but when it comes to LED DJ Lighting the LED DJ Lights usually have fans on the back of the item which makes them get even less warm and become cooler , LEDs do not get that  warm anyhow so if A kid touches them they will not burn themselfs , Hologen Lighting You would burn yourself and you could possibly get A 3 - 5 degree burn , I don't even think they make Halogen Light bulbs anymore when it comes to DJing due to Halogen Lights are so dangeous 

VHF wireless systems generally operate within the 174 to 216MHz range (the range of TV channels 7-13), while UHF uses the 470 to 805MHz range (the range for TV channels 14-69). ... UHF also has more range than VHF, not because of power, but because the signals move through the atmosphere more easily.

Wired microphones are much easier to set up when compared to using a wireless system. There's less equipment required to use a wired microphone, saving you time when setting up so you can get through soundcheck much quicker. It may be easier for you to resolve any technical problems you run into during sound check.

Also When you have A Wired Microphone you don't have the Freedom or as much space to move around , With Wireless Microphone you don't have that Microphone Cable or Microphone Cord that leaves you A certain amount of space to move around , Also with A Microphone Cable or Microphone Cord its very easy for you to trip , Fall and to get tangled up , Wireless is the way to go at least that is my opinion .

The biggest difference between passive and powered speakers is the way they're amplified. Passive speakers need to be hooked up to a stereo receiver, which sends an audio signal from your home theater gear (a turntable, lets say) to them.

I like Powered Speakers myself , The speakers has A amplifier built into the Speaker , Passive Speakers do not , Passive Speakers you have to put the wires into the Red and Black Ports or use A 1/2 inch jack power cable and insert it into the speaker

WiFi speakers connect to your home network; they usually run on AC power, so they require an outlet. Bluetooth speakers are paired directly with a device like a phone or a laptop.

I use Bluetooth Speakers , You don't have to plug any cables into your Bluetooth Speaker if your using the Bluetooth Function because Bluetooth PA Speakers usually have A option to plug in RCA Cables , But if you was to use RCA Cables you would need some sort of Audio Interface or A Amplifier that has the ports your need to plug in the RCA cable 

Uplighting refers to lights that are mounted to shine their light upward and are installed at low or ground level. Downlighting refers to lights that shine their light downward; so they would be installed at a higher to point to create this downward light effect.

When it comes to use DJ Uplighting people usually use the uplights to shine the light up on A wall  , Effect lights have some sort of Shapes or patterns .

In general, a spotlight is referred to a light that has a focused light creating more of a “spot” than a “wash” of light. The term floodlight is used when referring to a very wide spread of light that washes a wall.

A Spot light for example is A light that shines A light on A person or A specific object 

Nightclub lighting always adds to the entertainment, emerging light, sound and people with atmosphere to take the crowds experience over the top. Nightclub lighting is available in a few different configurations. These include, Moving Head, Spots, Beams and Scanner type lights as well as Par Can and Wash bar Lighting. Moving head lights can be a combination of spots, beams or washes and are usually focused over the dance floor, however can be implemented anywhere the lighting deigned wants to add the dramatic affects of moving light. This can be over the dance floor, all over the club or as a focal point on stage or DJ booth. Moving head lighting are lights that mount to a motorized yoke system and can move and sweep the light beams for that “Search Light” lighting effect.

Par can and wash bar lighting are usually LED and can combine and mix almost any color combination wanted and are usually used as accent, stage or effect lighting adding to the overall lighting design of the nightclub, these lights are used to light up the stage area, DJ booth, for wall washing or mood lighting

Nightclub lights are controlled via internal programs that operates the lighting with different modes like Sound Active, Auto or DMX - Sound Active will operate the lights internal programs to display the lighting effect to the beat of the music. Auto mode will go through the internal programs in a random pattern regardless of any input. DMX (Digital MultipleX) or Intelligent lighting will use DMX controllers or DMX software that generates movements according to the programming. Most of the more advanced nightclub lighting systems will use a 512 DMX control system that lets you control every aspect of the lighting. This allows for total control over the lighting design and effects

These lights and also be linked together and controlled as a Master / Slave set up, so what ever the (1st - Master) light does, all other will do the same exact effects

No. If all features are the same meaning they both have the same lamp power and type, the same lense optics, and both have or don't have things like a rotating a prism(yes you can get that in a scanner), then they will deliver the same results in terms of distance and coverage. The BIG difference between scanners and heads is the speed at which they can move, a scanner just has a single piece of glass to control while a head has to move it's whole bulk back and forth, so a scanner can produce much faster movements, and there is also the range of movement with a scanner often having 120deg or less range while a head can often move 540deg, but that can be more of a problem than an advantage if you want to keep the lights focused on the dance floor.

Car speakers are likely to have 4 ohms of impedance, whereas your home theater speakers will have 8 ohms. It is extremely rare for car speakers to have more than 4 ohms of resistance. There are a couple of reasons for this.

A car battery typically produces between 12 and 14 volts, compared to a home outlet which delivers around 110 volts. Because of this, the amplifier in your car is usually going to be low-voltage and high-amperage. As you might expect, the amplifiers in your home will likely be the exact opposite - low-amperage and high-voltage.

Since your car has a lower voltage, the speakers will need less resistance to get the amount of power necessary. An amplifier that can deliver 50 watts of power at 8 ohms will be able to deliver 75 or 100 watts of power at 4 ohms because the current is less restricted. Because of this, most companies design car amplifiers explicitly for 4-ohm speakers.

As you might expect, the opposite reasoning is true of your home speakers. Since your home outlets offer a much higher voltage, it needs a smaller percentage of that to be passed along to the speaker and is likely to have a higher impedance rating. There are 4-ohm home theater speakers out there, but it is rare for car speakers to have a higher impedance than 4 ohms.

The most obvious difference between car subwoofers and the ones used for home theaters is the size. Not only does the cabinet size of the speaker make room for a more powerful subwoofer, but it is also necessary if a subwoofer is going to be active.

An active subwoofer is a subwoofer that has an internal amplifier built in. It does not need to rely on the stereo amplifier for power, and therefore has a lot of flexibility and can be a lot more powerful.

Active subwoofers, since they have their own amplifier, also need their own power source. The easiest way to tell if your home theater subwoofer is active is by determining if it needs to be plugged into a power outlet. Passive subwoofers only need to be plugged into the amp. Active subwoofers require a wall outle

As you might imagine, the subwoofer in your car is going to be passive - unless you really put the effort forth for something active. When you can hear the bass coming from a passing car 3 blocks away, you can be reasonably sure they’ve installed an active subwoofer.

The size difference also creates a difference in efficiency between the two subwoofers. The subwoofer in your home is designed to move a lot of air and produce sound for a large area. The subwoofer in your car is designed to fill the vehicle cabin with sound, which is a much smaller space.

A Par Can Light is a lamp that generates a highly directional light beam, because of this function particularity, they are the favourite of stages around the world for illuminating a single person or event.

A Light Source– This started being an incandescent bulb and it’s the part of the par can light that dictates the power of the beam.The most common at the time were tungsten filaments and halogen lamps. For theatre use and big stages where you can find smoke, higher-temperature hydrargyrum medium-arc diode lamps are more common. The main characteristics of these lamps are that they cut through smoke and fog and become more visible when there is a lot going on.

A Parabolic Reflector – Parabolic reflectors can be made with many different materials, the most common one is a brushed aluminium surface. This part of the construction will determine the spread of the beam.

A Lens – The lens is fitted between the light source and the front part of the lamp. It provides a wider reflection for the light and helps it enlarge the beam while remaining focused.

These three elements are usually part of the same unit except for big par can lights like PAR56 or PAR64. Because of the intensive use and the size of it, the creation of par can lights with replaceable independent parts made the costs of repairing them much lower.

The spotlight operator or followspot operator is a theatrical technician who operates a specialized stage lighting instrument known as a followspot. A followspot is any lighting instrument manually controlled by an operator during a performance.

A gobo is an object placed inside or in front of a light source to control the shape of the emitted light and its shadow. For studio photography purposes, the term "gobo" has come to refer to any device that casts a shadow, and various pieces of equipment that go in front of a light

A “Gobo” is a small stencilled circular disc, and used in lighting fixtures to create a projected image or pattern. The term Gobo is short for “Go Between Optics”, describing the location where it needs to be positioned in the light path of a lighting fixture.

A gobo (which stands for 'goes before optics') is a stencil that is placed inside projector which produces a light projection of an image or text. You've probably seen them used at weddings or at restaurants where they're used to project a logo onto the wall .

Gobos are made of various materials. Common types include steel, glass, and plastic.

Steel gobos or metal gobos use a metal template from which the image is cut out. These are the most sturdy, but often require modifications to the original design—called bridging—to display correctly. To correctly represent the letter "O" for example, requires small tabs or bridges to support the opaque center of the letter. These can be visible in the projected image, which might be undesirable in some applications.

Glass gobos are made from clear glass with a partial mirror coating to block the light and produce "black" areas in the projected image. This eliminates any need for bridging and accommodates more intricate images. Glass gobos can also include colored areas (much like stained glass windows), whether by multiple layers of dichroic glass (one for each color) glued on an aluminium or chrome coated black and white gobo, or by newer technologies that vary the thickness of the dichroic coating (and therefore the color) in a controlled way on a single piece of glass—which makes it possible to turn a color photo into a glass gobo. Glass gobos generally offer the highest image fidelity, but are the most fragile. Glass gobos are typically created with laser ablation or photo etching.

Plastic gobos or Transparency gobos can be used in LED ellipsoidal spotlights. These "LED Only" plastic gobos can be full color (like a glass gobo), but are far less delicate. They are new to the market, as are LED lights, and their durability and effectiveness vary between brands.

In the past, plastic gobos were generally custom made for when a pattern requires color and glass does not suffice. However, in a "traditional" (tungston-halogen) light fixture, the focus point position of a gobo is extremely hot, so these thin plastic films require special cooling elements to prevent melting. A lapse in the cooling apparatus, even for seconds, can ruin a plastic gobo in a tungsten-halogen lighting instrument.