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How to Buy the Right Light Bulb

by on September 27, 2021
in Health and Home, Lighting, Tips & How-Tos, Money Savers, Green Tech :: 16 comments

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Buying a light bulb is a little more complicated than it used to be. You can't just pick up a similar watt bulb and expect it will match the other bulbs in the room, or even work in your fixture. So before you purchase your next bulb, you should arm yourself with these five facts.

1. Check your bulb base size and bulb shape

Light bulbs come in a variety of sizes and shapes, depending on where you're using them. The standard light bulb used in U.S. households is an A19 bulb with E26 base. The E means that the bulb has an Edison Screw and the 26 means the base is 26mm across (in Europe you'll find E27 bulbs). The A refers to the bulb shape. A is for arbitrary and is the shape that we all think of when we envision a light bulb (C is for candle, G is for Globe etc.) The number 19 designates the size. has a great light bulb shape chart for reference. The site also has a handy light bulb base chart.

2. Determine much light you need

Wattage is no longer the best way to determine which bulb will be a direct replacement for the bulb that just burned out. Instead of watts, look for the number of lumens, the measure of how much light a bulb produces rather than how much energy it uses. You'll usually also see a watt equivalent, but to be sure, look for the lumens. Here's a cheat sheet for replacing incandescent bulbs:

  • If you used to buy 100 watt bulbs, look for a bulb with 1600 lumens.
  • If you used to buy 75 watt bulbs, look for a bulb with 1100 lumens.
  • If you used to buy 60 watt bulbs, look for a bulb with 800 lumens.
  • If you used to buy 40 watt bulbs, look for a bulb with 450 lumens.

The fixtures in your home will have a rating for the maximum watts they are capable of safely handling. If you buy an energy-saving bulb and want a brighter light, you can buy a bulb that delivers more lumens and still stay safely within the maximum wattage allowed. For instance, a 9-watt LED bulb delivers the same amount of light as a 60-watt incandescent bulb. So you could safely move up to a 15-watt LED bulb, which would deliver the same amount of light as a 100-watt incandescent bulb. 

3. Select the right color of white for your light bulb

White light bulbs have a color cast. They can be the warm, yellow light of the traditional incandescent light bulb, the cool, blue light of daylight or somewhere in between. Manufacturers like to use terms like "soft" or "warm" or "daylight." Unfortunately, these terms aren't standard across manufacturers. To determine the direct color replacement, you should look at the color temperature, which is measured in degrees Kelvin. Here's how 

  • 2700 - 2800K: Warm, yellow light 
  • 3000 - 3200K: Still slightly yellow, warm light
  • 3500 - 4000K: A neutral, bright white light
  • 5000 - 6500K: A slightly bluish, bright white light

Smart LED lights can change their color across the spectrum of white light (and some can produce a wide range of colors as well). These may be of interest as different color variants may work better for specific tasks—for example, you might want a bright blue-tinged white light in the morning or for better contrast while reading but enjoy a warmer light at bedtime. Blue light has been shown to interfere with sleep, which is another advantage of being able to adjust your lights to warmer tones at night. 

Finally, not all light bulbs accurately show the true colors of an object. Color accuracy is measured on the color rendering index (CRI) on a scale from zero to 100. Incandescent and halogen bulbs have a perfect CRI of 100. As long as a compact fluorescent or LED bulb has a CRI of 80, it's considered good, and over 90 is regarded as excellent. 

4. Find out if you need to dim your light

Not all light bulbs can be dimmed or used in 3-way fixtures, especially compact fluorescent and LED bulbs. The packaging should specifically say that the bulb is "dimmable" or "3-way" in order for you to know that the bulb will indeed work with your dimmer or 3-way fixture. 

5. Find out if your light bulb will be used in an enclosed fixture or recessed can

Light bulbs that are used in enclosed fixtures and recessed fixtures heat up more than if they're used in open fixtures. LED bulbs are especially sensitive to heat won't last as long if used in these types of fixtures. If you want your LED bulb to last longer, make sure you look for a bulb that rated for use in a enclosed fixture. You can find enclose-fixture rated LED bulbs on Amazon.

6. Choose the right type of light bulb

When you're buying new bulbs—no matter the type—you'll want to look for the Energy Star label. Energy Star certified light bulbs are tested to meet energy efficiency standards and will include labeling to tell you exactly what you're buying. The Energy Star label will show the bulb's brightness (in lumens), color (i.e. color temperature), lifespan, energy usage, and what it will cost to run it for a year. This information makes it easy to compare bulbs, especially if you're considering bulbs of different types.

There are three types of energy-saving bulbs on store shelves: 

  • Energy-saving incandescents (halogen): These lower wattage incandescent bulbs have a tungsten filament like standard bulbs, but are surrounded by a halogen gas, rather than argon or nitrogen, which provides bright light with better efficiency. These are 25% more efficient than traditional incandescent bulbs and will last three times as long. Prices start at just under $1.50 per bulb (750 lumens). 
  • Compact fluorescents (CFLs): You've probably seen—and maybe hated—these curly, bulb-sized fluorescents. Though early versions tended to offer harsh light, the latest CFL bulbs have more color options and some are even styled to look like traditional incandescent bulbs. These bulbs offer 75% energy savings over an incandescent and last ten times as long. Prices start under $3 per bulb (850 lumens). 
  • LEDs: The most efficient option, LED bulbs are 75-80% more efficient than traditional incandescents and last up to 25 times longer. Prices start at just under $2 per bulb (800 lumens), though the less expensive bulbs tend to be rated at 10 years, not 20. 
  • Smart bulbs: Smart bulbs are LED bulbs that can connect to WiFi or Bluetooth so you can control them from your smart assistant (Amazon Alexa, Google Assistant, or Siri) or a smartphone app. While the functionality is a bit different for each bulb, you can typically tell them to turn on or off at different times and turn them on or off from afar. Some bulbs will even have the option to control the light color. Prices start at just under $10 per bulb (800 lumens).

Let's take a look at just what each type of bulb will cost you, estimating 3 hours of use per day at $0.11 per kilowatt hour.

Bulb Type Philips Halogen Lamp (750 lumens, 43 watts) Sylvania dimmable Compact Fluorescent (850 lumens, 13 watts) Philips LED Flicker-Free Dimmable LED (800 lumens, 8.5 watts) Sengled dimmable smart bulb (800 lumens, 8.7 watts) 
Bulb cost $1.49/ea $2.75/ea $3.24/ea $6.67/ea
Energy use $6.38/yr $1.57/yr $1.02/yr $1.05/yr
Lifespan 1.8 years 9.1 years 22+ years 22+ years
Cost over 20 years $145.48 $39.65 $23.64 $27.67

As you can see, with the falling price of LED bulbs it makes less sense to bother buying older, less efficient bulbs. Even with a higher up-front price, the energy savings over the life of the bulb can be substantial.

Updated on 9/27/2021 with new tips, products and pricing.

[Image credit: buying a light bulb via BigStockPhoto]

Discussion loading


From riley smith on March 13, 2018 :: 8:28 pm

I didn’t know that LED lights are able to last 25 times longer than other bulbs. My wife just bought a new lamp and we have no idea what type of lightbulbs to use. It would be nice to try LEDs because then we wouldn’t have to replace them as often.


Color effect

From Howard on September 07, 2018 :: 6:36 pm

Good article- do you know where I can find how led lights effect the color of paint.


Hyperikon CRI bulbs

From Ariel on March 23, 2020 :: 4:18 pm

CRI is what helps paint color look good. I learned it when I accidentally bought the wrong bulb, so you want to look for high CRI level in the bulbs if it’s specifically used for showing true colors of paint!


Promises promises!

From Karen on January 26, 2019 :: 9:36 pm

We built our home 11 years ago. All the bulbs in the house are commercial grade 130 v filament. I’m still using bulbs we put in at finish of build. I can’t get a led to las more than 2 years much less 25 years. I had saved my boxes with receipts so I could return but now I seemed to have misplaced them. So my question is ??? Which led really last years! Some of my incandescent bulbs have never quit in 11 years! So what’s the point of paying more for abukb if you have to buy another high dollar bulb in a year or less! I might be using less electricity but spending double on bulbs !


Could be the brand of bulb or your setup?

From Josh Kirschner on January 29, 2019 :: 10:35 am

It’s hard to say without knowing more about your setup, but there are a few reasons when LED bulbs can burn out quickly:
1) Cheap, no-name bulbs may be of lower quality, and their circuitry less able to withstand heat or issues with the electric current
2) LED bulbs don’t do well with heat, so use in enclosed fixtures or recessed cans (unless they’re specifically designed for that) can cause early burnout.
3) Dimmers that aren’t rated for LED bulbs may be causing power issues that are leading to early failure of the LED bulbs. Given your house is 11 years old, I wouldn’t be surprised if the dimmers are not LED-rated.
4) Electric surges in your system may affect the more delicate LED circuitry than your incandescents.
5) Fluorescent lights on the same circuit can damage LED lights due to the voltage surge when switching them on or off, or flashing each time they start up.

I would at these factors and see if they might apply to your situation. Or consult an electrician who ca give you a more precise answer.


Fast burnout

From Yoleen on October 27, 2022 :: 1:51 pm

I know whatcha mean. I never had a compact Fluorescent that lasted more than two weeks.Not one


Bright & Reliable

From Aaron on March 23, 2020 :: 4:16 pm

LEDs are the best, we’ve switched our bulbs to LED a few years ago and all of them still work great! the best thing is that they don’t get as warm as the older types. The company I get mine from even has a 5yr warranty but says lasts 10+ years. crazy to think about but why not!


need to find a replacement for:

From Debbie on April 29, 2022 :: 10:19 am

I need to buy some replacement bulbs for:



I have searched the web and cannot find this bulb, can you help??


You can use another brand

From Josh Kirschner on April 29, 2022 :: 11:20 am

You can use any brand to replace those bulbs. The key thing is to match the lumens and light color as closely as possible. The original Zilotek are 1000 lumens (65-75W equivalent), have a color of 3000K (warm or soft white) and are size/shape BR30. If your floods are dimmable, make sure you buy bulbs that are dimmable, as well. These options are available on Amazon which come very close to what you are looking for:


thank you!

From Debbie on April 29, 2022 :: 4:46 pm

Thanks, I appreciate your answer!


Missing bulb

From Carol on May 06, 2022 :: 4:58 pm

I have a light socket that says E 18 3200 on it. No bulb in this light. What kind of bulb does it take? Been looking for months. Know now why they did not have bulb in these lights.


Where oh where have my little bulbs gone?

From Juliette Exupery on July 03, 2022 :: 7:30 pm

What are the smallest lumens to closely equal a 15-watt light bulb? I am night blind and use small lamps in my bedroom and hallway (standard base) at night. I can’t seem to find this wattage anymore, or it has so many other stats piled on it I can’t figure out the actual wattage.


That's around 65-100 lumens

From Josh Kirschner on July 05, 2022 :: 7:38 pm

A 15 watt incandescent bulb is around 65-90 lumens (depending on manufacturer and bulb type). The LED equivalent is about 2 watts. You can still find the 15W incandescent ones pretty easily on Amazon ( as well as the 2W LED versions (


You can not fix stupid

From Frank Ehbrecht on October 06, 2022 :: 3:02 pm

Let say you wish to buy a lamp for taking pictures, there are many on Amazon but none come with a light bulb, whoops lost sale


Light bulbs have started betraying me

From Hinoj Mohanan on October 19, 2022 :: 8:56 am

First, congratulations you choose such distinct topics to write about. Honestly, I had never imagined, I will ever read a blog on this topic, but since my light bulbs have started betraying me and my husband complains of improper lighting, I am here. Do you think installing Smart LED bulbs like around the whole house is a good idea?


I am 61 years old and I no longer know how to buy a light bulb.

From Yoleen on October 27, 2022 :: 1:49 pm

I don’t. I have no idea how to buy a light bulb anymore. My two bulb light fixtures have only one bulb left in them .I am moving to candles . Forget my poor lava lamp. Don’t know if I will ever be able to use that again. Technology is such a pain in the ass. Can’t just learn how to do something. Got relearn everything Every year because the tech heads redesign everything. Helpful article. Still sitting in the dark.


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