PROCESS SAFETY
have a number of important advantages. First is the obvious benefit that because they are brighter, they are much more effective in performing their function of being clearly visible and capturing attention in all ambient light conditions, including outdoor installations. High luminosity is also increasingly critical indoors. Industrial spaces are being equipped with better artificial lighting and more natural lighting is being used for energy saving and sustainability.
Stack lights are widely used as warnings and alarms to protect workers, equipment and buildings from elevated levels of hazardous chemicals. For example, green lights may signify very low levels. A yellow light with an audible signal would designate detection of say, five parts per million of ammonia gas. And flashing red, with a strobe light and a loud audible alarm would be triggered at more dangerous levels.
A new generation of stack lights incorporates LED elements to replace incandescent bulbs. The LEDs, which can be 10,000 per cent brighter,
A second benefit is that LEDs last much longer than incandescent bulbs. Whereas incandescent bulbs typically are rated at a lamp life of only 2,500 hours under ideal conditions, LED elements last for at least 50,000 hours. Moreover, LEDs are not vulnerable to vibration and shock the way incandescent bulbs are.
Third, LED bulbs generate less heat and consume much less electrical power.
All of these benefits are important, but they are commonplace for many other applications where LEDs have replaced incandescent bulbs. Perhaps the most significant advantage of the new generation of stack lights comes from the much smaller size of the LED elements compared to incandescent bulbs.
One of the problems with incandescent bulbs is they need to dissipate heat, and therefore to
produce more luminosity, you need a larger bulb, which in turn is encased in a larger colored lens. As a result, stack towers varied in diameter up to four inches (100 mm). State-of- the-art LED stack towers have lenses that are about half the diameter even though the systems are much brighter.
Catalogues for signal towers with incandescent bulbs can run 100 pages or more, with varying bulb and lens sizes needed depending on the luminosity requirements for each application and environment. Selecting the right size and figuring out all the parts required has complicated the ordering process. And if a facility requires a variety of sizes, maintaining an inventory of all of the different spare parts gets to be costly and burdensome. The new state-of-the-art LED signal towers are bright enough so that one-size-fits-all, or nearly all, applications. It is now much simpler to figure out what is needed for each application, and maintaining inventory is much cheaper and easier.
Signaling towers are a simple and effective solution for a wide variety of applications. Now they are as easy to order, install and maintain as they should be.
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