If you're looking to replace a 100W light bulb, you'll find several LED options at prices that aren't nearly as unreasonable as they were just a year or two ago. The current crop, including the Philips 100W Equivalent LED, hovers right around the $20 price point.
Initially priced at $25, Philips' LED has since been marked down a few bucks to $22, which is still slightly more expensive than what you'll see from competitors like GE and Cree. Philips justifies that by claiming an extra 80 lumens' worth of brightness over those two, along with superior dimming capabilities. However, our tests didn't reveal any noticeable difference in either brightness or dimmability. That, along with the fact that Philips offers half the warranty that you'll get with GE or Cree, makes this bulb difficult to recommend.
Philips' 100W Equivalent LED shares the same, flat-topped build of its smaller siblings in the 60W and 40W categories, but sets itself apart with a unique design that splits the bulb into three sections separated by deep channels. This helps keep the heat buildup at bay, something that gets especially important when LEDs start putting out this much light.
Even with the emphasis on thermal management, the bulb gets hot to the touch after just a few minutes of use, which isn't unusual for a 100W replacement LED. As such, Philips recommends not using it in an enclosed fixture -- if you do, you'll risk shortening the bulb's lifespan.
That lifespan is rated at 25,000 hours, the same as the other 100W replacement LEDs I tested, with the exception of Utilitech. That lifespan comes out to 22.8 years if the bulb is used for an average of 3 hours per day. Philips warrants the bulb for the first five of those years, while GE and Cree both offer ten-year warranties.
25,000 hours is the longevity benchmark for Energy Star certification -- the Philips 100W Equivalent earned certification over the summer, as did the GE LED I tested. Cree's bulb isn't certified yet, but it meets the criteria -- Cree's team tells me they expect it to be certified in the near future.
|Cree 100W Replacement LED||GE Energy Smart 100W Replacement LED||Philips 100W Equivalent LED||Sylvania 100W Replacement Ultra LED||Utilitech 100W Equivalent Warm White LED|
|Efficiency (lumens per watt)||89||100||88||84||100|
|Estimated yearly energy cost||$2.17||$1.93||$2.29||$2.29||$1.93|
|Color temperature (stated / measured)||2,700 K / 2,663 K||2,700 K / 2,602 K||2,700 K / 2,628 K||2,700 K / 2,664 K||3,000 K / 2,999 K|
|Lifespan||25,000 hours||25,000 hours||25,000 hours||25,000 hours||18,000 hours|
|Color rendering index||80||81||80||83||85|
|Weight||5.80 oz.||5.65 oz.||8.50 oz.||11.45 oz.||7.80 oz.|
Philips claims a light output of 1,680 lumens at a golden hued 2,700 K from a power draw of 19 watts. That makes it good for about 88 lumens per watt -- an impressive number, but not as impressive as GE and Utilitech, which both manage to put out 100 lumens per watt.
Those 1680 lumens are a slight step up from what you'll get with GE, Cree, or any of the other bulbs we tested. With brightness being one of the first things you want from your home lighting, that number would appear to give Philips an edge, albeit a minor one.
However, the engineers at Energy Star test bulbs out for themselves, posting the full specs for every LED they certify online. On Philips' listing, Energy Star rates the bulb at 1,620 lumens -- not 1,680. While an extra 80 lumens is just barely enough to make a noticeable difference, an extra 20 lumens is largely insignificant. We wanted to know which number had it right.
From a simple eye test, the light put out from the Philips 100W Equivalent LED doesn't differ much from its nearest competitors, the Cree and GE 100W replacements. Side by side, the three have nearly identical glows, all of them boasting similarly warm tones. That isn't surprising, given that all three are rated with the same 2,700 K color temperature. When tested, each one erred low, on the yellowy side.
Remember, though, that Philips claims to put out 1,680 lumens to Cree and GE's 1,600. That's a pretty minuscule difference, but it's one that should be noticeable if you're looking closely for it. The problem is that I couldn't notice it.
Testing bulb brightness gets a bit tricky. In addition to measuring color temperature and color rendering scores, our spectrometer can take luminosity readings from a given light -- but those readings are easily skewed by things like viewing angle and distance. To get numbers you can rely on, you need something called an integrating sphere.
An integrating sphere is really just a big, hollow ball with a special, reflective coating on the inside. You place the bulb in the middle with the spectrometer peeking in. With a "baffle" between the light and the spectrometer blocking a direct, inaccurate reading, the spectrometer will instead read the luminosity of the light that's bouncing around inside the sphere. If calibrated correctly, this should give you an accurate read of how many lumens a given light source gives off.
Of course, integrating spheres like the ones used by Energy Star and UL are terribly, terribly expensive. So, in lieu of buying one, we built our own.
This wasn't a quick undertaking -- we researched our options for months, speaking with various industry experts to get the best sense of how to pull it off. Finally, led by intrepid technical editors Jared Hannah and Steve Conaway, we started putting the thing together.
The result is a gigantic and hollow styrofoam sphere with a few carefully-applied coats of special, reflective paint on the inside. We're still working to calibrate it as precisely as possible, but have already seen results that look to be within roughly a 1 percent margin of error.
Looking at the 100W replacement LEDs we tested, Philips actually scored the lowest in our sphere, with a score that fell just shy of the 1,620 lumen spec from Energy Star. All four of the other bulbs we tested came in at least slightly higher, a result that lines up with what we see when we compare the bulbs side by side.
That isn't necessarily a bad result -- anything over 1,600 lumens is perfectly adequate at the 100W replacement level. However, it does undercut the notion that Philips' bulb offers extra brightness over the competition.
Something else I took a close look at was how these bulbs performed with dimmer switches. Though many bulbs are listed as "dimmable," some won't dim down as low as others. You also might encounter flicker and buzz due to electromagnetic interference from the dimming mechanism. When I tested dimmable 60W replacements, the Philips bulb was a clear standout, making it easy to recommend for anyone who likes the light dialed down low.
The 100W version of the Philips LED is equally impressive, with zero flicker, zero buzz, and a minimum lumen output that's slightly lower than GE or Cree. However, GE and Cree's LEDs still did well. Unlike their 60W counterparts, neither one flickered or buzzed on any of the switches we tested them with. That makes Philips' dimming performance less of an important factor.
The Philips 100W Equivalent LED is a good bulb with solid across-the-board specs. It's bright, it's efficient, it's dimmable, it's omnidirectional, and it comes with a respectable 5-year warranty. At a price of $22, you could certainly do a lot worse.
The problem is that there's some very good competition in this class, including a very efficient GE bulb and a Cree LED that breaks the $20 price barrier. Both of those cheaper options keep up with the Philips LED at every turn, and surpass it in a few key spots, including the ever-important length of warranty. The Philips 100W Equivalent LED is good, but you can do better if you shop around.