Although LED T8s have not been around long enough to produce a thick memoir, there are some interesting things to note about why they exist.  A few years ago, there was concern that the rare earth metals used in fluorescent tube lamps might start getting significantly more expensive for the U.S. to purchase from China. Light bulb manufacturers began an arms race to develop an affordable and effective LED T8 replacement tube.

A sustained sharp increase in the price of phosphors never really happened. And so LED T8s have gained momentum in their evolution, organically evolving to better perform well in certain applications. Their price point has decreased, and their performance has gone up. And now, LED T8 linear lamps are certified by the DesignLights Consortium to be high quality, high efficiency lighting products.

However, LED T8s continue to be very controversial – even divisive – in the lighting world. Many people think they’re great; but some people think their existence is entirely unnecessary. Both sides of this argument tend to contextualize their visions of the merits and pitfalls of the LED T8 in a comparison with the merits and pitfalls of the traditional fluorescent T8 tube light.

LED T8 Linear Light Bulbs vs. Fluorescent T8 Linear Light Bulbs

First of all, the merits of fluorescent T8s cannot be overstated. Fluorescent tube lamp technology has been developed over decades and is now basically mastered. Fluorescent T8s are extremely inexpensive and have ridiculously long rated lives. In fact, in some cases, fluorescent T8s can last as long as LED T8s!

And it doesn’t stop there. The production of light with fluorescent tube lamp technology works really, really well. It is probably at its peak in terms of performance and cost. Fluorescent T8 light bulbs can last 50,000 hours. And despite their not-always-positive reputation for rendering color, fluorescent T8s can achieve high color rendering indexes (CRIs). But, it must be clearly noted, fluorescent T8s get more expensive as you seek a higher CRI.

And in terms of cost, let’s just say it straight: In many applications, the LED T8 tube light’s initial cost doesn’t make sense when compared to the relatively low cost of fluorescent T8s.  For example, at this stage of the game (June 2014), lighting large spaces like classrooms or large offices is job better performed by fluorescent T8s than LED. First, there’s the cost. Fluorescent tube lamps last long, cost little, and give off crisp light. Furthermore, fluorescent tubes give off light omnidirectionally, casting light upwards toward the ceiling as well as downward. This makes a space look more fully lighted. LEDs, in contrast, are generally more unidirectional and cast light downward only. This is something that will change, but, currently, this is just affirmation of the fact that fluorescent T8s reign supreme for some applications.

Fluorescent T8s often take a while to come on; they’re adversely affected by temperature (and somewhat sensitive about it); they can flicker often; and if the lights are turned on and off frequently, as in laundry room or bathroom applications, for example, they can fail quite prematurely, to the dismay and annoyance of everyone involved. And then there’s that toxic mercury vapor which poses danger to humans and the soil on which we live.

Oh yeah, fluorescent tube lamps require a ballast, too: A component that will also, eventually, fail.

Now, let’s give some attention to LED T8 tube lamps. It should first be noted that LED T8s have a higher initial cost than fluorescent T8s, which can be purchased for only a few dollars in some cases.

Despite their higher cost, LED tube lights have some nice advantages. First of all, LEDs love the cold, so they are great in cold weather applications, unlike fluorescent T8s, which become seemingly infirm in the cold, slow to turn on and flickerish. Basements, sheds, garages, porticos, covered pathways, bathrooms, etc, are great places to utilize the LED T8 linear lamp.

You also have to consider that if an LED T8 tube breaks, it will not release harmful mercury vapor into the air. Mercury from fluorescent tubes can get into the air but also the water supply, which is why you have to recycle them. For some people, the whole mercury thing is enough to open their minds to alternatives to the long-reigning fluorescent T8.

Plus, you can get better color rendering with LEDs than with fluorescent lights. Fluorescent lights work by transforming ultraviolet radiation into visible light. If you have a vague idea about what UV light is, you know that it’s the part of the light spectrum that’s just past the blue and violet area. Even with a rudimentary understanding of light, then, it’s easy to see how the result of transforming UV light into visible light would leave you with a bluish result. As a result, in general, fluorescent lights do not render reds well.

LEDs exude very little to no UV or infrared radiation, both of which fade the color of displayed objects including wall art, furniture, and even rugs. Fluorescent tubes – did you know this? – do indeed fade sensitive belongings over time.

Finally, LED tubes do not generally require a separate power supply. They run on line voltage and require no separate drivers, ballasts, or transformers. That’s one less thing that can break. In conclusion, LED T8s are more expensive than fluorescent T8s, but LEDs are safer, render color better, require no ballasts, operate better in the cold, and do not decline significantly in lifespan due to frequently switching on and off. This means that there are some applications, like cold places, bathrooms, basements, laundry rooms, kitchens, closets, storage rooms, walk in refrigerators or freezers, or places where there’s a risk of broken light bulbs like gyms, warehouses, etc, for which LED T8s might be the better choice. And since LED T8s don’t weaken with frequent switching on and off, they are great for use with occupancy sensors.

As we've discussed before on this blog, spring brings with it a few weeks of abnormally wet weather here in the Mid-Atlantic, which is evidenced by the current storms that are barreling down on the region. Basements throughout Maryland, Virginia and Washington, D.C. are regularly flooded as a result, potentially costing homeowners thousands of dollars in damage if they didn't prepare accordingly.

While most residents know the importance of having a sump pump to keep the water out, there are other precautions that residents need to take to avoid catastrophe when their basements begin flooding.

Many older homes often feature electrical systems that are outdated and not up to current safety codes. One particularly sensitive kind of wiring is the "knob and tube" design, which leaves a complete grid of crisscrossing wires exposed along the ceiling of the basement. Its been decades since this kind of layout was considered acceptable in residential structures, and homes that have them are more than likely dealing with wires that have seen much better days.

During extreme weather conditions, any number of events could result in a deficiency in the system that may either spark a fire or down a wire in homes that feature knob and tube layouts. If the wires in the basement either fall or are damaged in the event of a flood, they have the potential to expose electrical currents to a growing pool of water. This is an extremely dangerous and potentially fatal safety hazard for homeowners to contend with.

If you are looking for a place to escape from life’s every day hustle and bustle,Look for IP (Ingress Protection) rated fixtures that are waterproof, meaning dust-tight and protected against long immersion in water, rather than simply “water safe” or “wet location safe” options.  Waterproof fixtures are meant to be submerged and will prevent water from entering them due to sealed assembly.  Take the precaution to ensure that your fixtures will meet all safety and application standards for an underwater environment prior to purchase or installation.

Ingress Protection (IP) ratings specify the environmental protection the enclosure provides.

The IP rating normally has two (or three) numbers:

An “X” can used for one of the digits if there is only one class of protection, i.e. IPX1 which addresses protection against vertically falling drops of water e.g. condensation.

IP First number – Protection against Solid Objects

IP Second number – Protection against Liquids

Voltage Requirements

When weighing your options on which type of fixture to choose, cost, convenience, and the size of your project are important. If one were to complete a large project for the grounds of a grand hotel, for example, line voltage (120V) would be the ideal option as vast distances may exist between the focal point and the fixture itself.

While it’s also true that standard incandescent bulbs can be found at virtually any hardware or household goods store, in an age where environmental awareness is important to daily life, technology and the public are moving in tandem towards different solutions. Since line voltage lighting consumes much more energy and will typically require the expertise of a licensed electrician, more homeowners are choosing low voltage (12V) options. Low voltage fixtures are notably the safer and less hazardous of the two choices, are often smaller, and easier to conceal within a natural landscape. They also have the added benefit of lower cost over time. Note that a transformer is required to convert to the lower voltage for fixtures which will be used underwater. You may also make use of photocells and timers to save on electricity consumption costs even further.

Let’s take a look at some examples of the different types of submersible low voltage products available today:

Low Voltage Halogen

This LED lights consume approximately 75% less power than incandescent units for the same amount of light output. This amounts to a sizeable savings over their life span. Moreover, standard underwater LED fixtures consume about 1/5 of the power as standard incandescent bulbs!

Besides energy savings, the nature of LED production makes them ideal for underwater applications. There are no bulbs to change as LED fixtures typically come in a permanently sealed housing. Sealed construction means underwater lights may be left in a permanent location with no concerns about extra cable allowances, or making provisions to change bulbs. They should, however, be accessible in order to clean the lenses during regular pond maintenance.