An L.E.D. is a digital component (full name Light Emitting Diode) which produces light when electric current passes through it in one direction. Select Yellow River lighting to get our more products.
Recently, the efficiency of LEDs has risen and the price has dropped, and thus it's possible to use LED lighting in a whole rig without losing significant brightness.
What kind of fixtures are available with LEDs?
There are always a wide selection of types of LED fixture available nowadays, which are beginning to mirror the qualities of incandescent stage lights.
Flood
LED floods are usually single colour, but available with colour mixing, in a variety of different sizes for applications as varied as outdoor security lighting to specialised lighting for stage cycloramas.
These are the most frequent, while they create a wash of light similar to that particular from a Parcan or even a Fresnel.
Usually RGB, but sometimes RGBW or RGBAW (red, green, blue, amber, white) to find the best array of colours.
The beam size (like a Parcan) is not adjustable of all, although there are zoom versions available.
Profile
Only widely available in the last few years, companies such as ETC are leading the way in which in LED technology which beats the same incandescent fitting, but with full, subtle, theatre-appropriate colour mixing. Although the products are very pricey, again, the values are dropping, and becoming more affordable. Most specialist suppliers will have the ability to demonstrate the products before you decide – it's important to see what you're getting, as the quality varies considerably if you choose cheaper products.
How do you use LEDs in a level lighting rig?
Power Supply
LED fixtures designed for entertainment use are not the same as regular stage lights.
Most LED fixtures contain processors and electronics to regulate the light, so they must not get in touch to a dimmer. The exact same applies for just about any moving light. They need a clean constant undimmed power source.
Some dimmer racks have a physical switch to ‘bypass'the dimmer, and provide the undimmed ‘hard power'the fixtures need. But many dimmer racks will damage the ability way to obtain moving lights or LED fixtures in the event that you attempt to power them from the dimmer, even when the dimmer is set to 100% output.
Modern stage lighting installations include the provision of power sockets on the lighting rig which are not via the dimming system – these can be utilized for data projectors, LED fixtures, moving lights etc. If your installation does not have such power supplies available, you may be in a position to unplug the feed to a certain lantern from the dimmer rack, and use an adaptor to enable it to be plugged direct right into a power socket. In the UK, many venues have 13A to 15A adaptors (square pin plug to round pin socket) which are employed for this purpose. As the 13A plug features a fuse in it, this technique is completely safe. The only issue is remembering to show them off after each and every lighting session (and remembering to show them back on again before the show!). To minimise power wastage, the proper sustainable practice is to show them on only if needed, and power them off if they're not needed again for a few hours.
Control Signal
A control signal must also get in touch to each LED fixture, which comes direct from the lighting desk, and is recognized as DMX512.
Some LED fittings are single colour, but most contain LEDs that may produce Red, Green and Blue light independently. These LED fixtures are called RGB, and enable a wide selection of colours to be produced on stage by mixing them together in varying amounts. An RGB fixture requires 3 DMX512 channels to regulate it, one channel for every single colour.
An even wider array of colours can be produced using RGBAW LED fixtures (Red, Green, Blue, Amber, White), including more subtle pastel shades. These require 5 DMX512 channels.
Each LED fixture has an ‘address'which is often set on the fixture, and tells each unit what control channels from the lighting desk to respond to.
For instance, in a small drama studio with 24 dimmers, the control desk needs 24 channels to regulate them. Adding LED fixtures into the studio increases the amount of control channels required. Adding four RGB LED fixtures will add 4 x 3 = 12 channels, if they're all to be controlled separately. So, in this example, the channels are allocated as follows:
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