General Questions

Incandescent era, RIP. Like it or not, it's time to move on. Traditional incandescent lightbulbs are gone—not banned, precisely, but phased out. The fact is, after more than a century of incandescents, we've become attached to them. They're cheap, they dim predictably, and they emit a warm and familiar glow. Weaning ourselves off them won't be easy. Most of us will probably buy halogens without even noticing. For about a few rupees apiece they are cheap, and they look, feel, and function almost exactly like traditional incandescents. But they're only about 25 percent more efficient. Meanwhile, CFLs, which are inherently flawed and generally unpopular, are steadily losing market share. That leaves LEDs, which offer the most sustainable—and exciting—alternative to incandescents. For starters, they're highly efficient: The average efficacy of an LED bulb is 78 lm/w (lumens per watt), compared with around 13 lm/w for an incandescent and approximately 18 lm/w for a halogen equivalent. Yes, LEDs have their shortcomings: Buying an LED bulb doesn't seem as intuitive as picking up an incandescent from your local electric store, and the up-front cost is high. But once you get to know the technology and the incomparable versatility that LEDs offer, you'll see the demise of the incandescent as an opportunity.

Aren't LEDs Expensive?

The days of the Rs 450 LED bulb are over. As demand has increased and manufacturing processes have become more streamlined, costs have plummeted. Additionally, utility company rebates have driven the price of many household replacements to around Rs 100; in some regions they cost half that. Sure, that's a long way from the 50-cent incandescent, but con sider this: LED bulbs consume one-sixth the energy of incandescents and last up to 25 times longer. Replacing a 60-watt incandescent with an LED equivalent will save you Rs 000 in energy costs over the new bulb's lifetime. The average Indian household could slash Rs 000 from its annual energy bill by replacing all incandescents with LED bulbs.

These Bulbs Dim, Right?

LED bulbs sold as "dimmable" work acceptably with most newer switches. The best dim to about 5 percent, though at that level some produce a faint buzzing. Make sure you buy a bulb that has been verified to work properly with your switch; check the manufacturer's website for a list of compatible dimmers. If you need to install a new switch, buy something specifically engineered to work with LED bulbs. But be warned: These switches are sometimes larger than older dimmers. In most cases that shouldn't be a problem, but if you have an overcrowded electrical box, you may need to upgrade it to accommodate the new dimmer.

I Miss My Bulb's Warm Glow

The higher the bulb's color temperature, the cooler its light. A candle glows at a color temperature of 1500 K. That CFL you tried but hated because its light was too harsh was probably running at around 4500 K. LED bulbs marketed as incandescent replacements usually have a color temperature of 2700 K, which is equivalent to typical warm white incandescents. But that's only part of the story. The quality of a bulb's light also depends on its color accuracy, also known as the color rendering index (CRI). The higher the bulb's CRI, the more realistically it reveals colors. Incandescent lightbulbs have a CRI of 100, but most CFLs and LED bulbs have CRIs in the 80s. According to a recent study by the DOE, only a handful of LED bulbs have CRIs in the 90s, though that will improve as efficacy increases. Note that the CRI is not always listed on the packaging, so you may have to search the manufacturer's website for it.

Where Can I USe Them?

Most LED Lightings follow dimension guidelines. Some have a bulky, space-age-looking heat sink; others incorporate this necessary part more elegantly into the engineering. So-called snow-cone designs have a heat sink that takes up the entire lower half of the bulb. These emit directional light only, which is acceptable in pendant fixtures but throws unwanted shadows when installed in, for example, a table lamp with a shade. For that you'll need an omnidirectional bulb, so check the packaging before you buy. Ready for complete adoption? You'll find LEDs in floodlights, spotlights, Streetlights and recessed-lighting formats, as well as in designer formats.

Okay, Now Impress Me

Wi-Fi-connected LED bulbs, such as those from Connected by TCP, can be operated from a smartphone. Taking it a step further, platforms such as Philips Hue and LIFX combine red, green, blue, and sometimes white LEDs to produce millions of colors, from bright purples to daylight whites. Most offer stand-alone, plug-and-play functionality, so you don't need to buy into a larger connected system. Integrate them into an IFTTT (if this, then that) recipe and their colors automatically adjust to suit, say, the weather, the time of day, or which sports team is winning.

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