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What Exactly is A GU24 Bulb?

This post has been updated from its original 2008 version.

You may have heard of the GU24 bulb and wondered what they are. Available in both CFL and LED, these bulbs have a different base than the standard screw base bulbs. GU24 bulbs have 2 pins protruding from the base instead of the usual screw in base. To install the bulb, you would insert the pins into the corresponding holes in the socket and twist the light bulb and lock it into place.

So why would you want to use a bulb with this base? What are the advantages?

  • The GU24 bulb is self-ballasted i.e., the ballast portion of the bulb is already attached to the bulb and is easy to replace.
  • The overall length of the bulb is shorter since the ballast and the bulb are in one unit
  • You can easily change the wattage of the bulb, unlike pin base bulbs which require the socket to be changed for different wattages of bulbs. This offers more flexibility.
  • The size and shape of socket is similar to an incandescent socket so it’s great for homes.
  • A standard GU24 Bulb is interchangeable between manufacturers.
  • The LED GU24 Bulb is long lasting with an expected life of 25,000 hours of life which decreases the need for regular replacement. At Conservation Mart we offer these bulbs in a variety of color temperatures ranging from 2700K to 4000K.

So next time you’re in the market for a lighting fixture, consider one that utilizes a GU24 base bulb.

Shop now for GU24 base bulbs>>>

Maxlite 9W LED Omnidirectional A-Lamp GU24 A19 4000K 9A19GUDLED40
Maxlite 9W LED Omnidirectional A-Lamp GU24 A19 4000K 9A19GUDLED40
Earthtronics 8.5W LED Omni A-Lamp GU24 A19 5000K  LA19850V224
Earthtronics 8.5W LED Omni A-Lamp GU24 A19 5000K LA19850V224



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Comparing the 13W GU24 Bulb to Incandescent Bulbs

This post has been updated from its original 2012 version.

Compact fluorescent lamps use significantly less energy than incandescent bulbs, and use energy to produce only light. In comparison, incandescents use a great deal of energy, with the majority of it being used to create heat. There are a variety of CFL bulbs available, with the GU24 base gaining in popularity. The 13w GU24 bulb is a great compact fluorescent replacement for 60 watt to 75 watt incandescent bulbs throughout the home.

When choosing to replace an incandescent light with a GU24 compact fluorescent, it is important to know a few basic facts about the bulb you are planning to buy. Let’s get into the major differences between these two types of bulbs.

Incandescent Bulbs

Energy used to create light: 10%
Energy used to create heat: 90%
Standard power used in a home: 60 watts to 75watts
Base type: Screw in, pin base

GU24 Bulbs

Energy used to create light: 100%
Energy used to create heat: 0%
Standard power used in a home: 13 watts
Base type: GU24

The GU24 base means the bulb has two pins protruding from the bottom that twist and lock only into a GU24 fixture. Also differing from incandescent lights is how light brightness is determined. The amount of light emitted from an incandescent bulb is determined by the amount of energy it uses. The brightness of a compact fluorescent GU24 is measured in lumens. This is how a 13w GU24 bulb with 950 lumens can replace a 60 watt incandescent bulb, and use approximately 78% less energy to do so.

Shop for LED GU24Bulbs>>>

Maxlite 9W LED Omnidirectional A-Lamp GU24 A19 4000K 9A19GUDLED40
Maxlite 9W LED Omnidirectional A-Lamp GU24 A19 4000K 9A19GUDLED40
Green Watt 9W GU24 LED 5000k G-L4-A19D30C-9W-50-GU24
Green Watt 9W GU24 LED 5000k G-L4-A19D30C-9W-50-GU24
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5 Important Facts About GU24 Bulbs

gublogWith incandescent light bulbs going the way of the Canadian penny, the time to learn about GU24 lamps is now. These consumer-friendly light bulbs are quickly becoming the new standard for energy efficient lighting, so before jumping into the conservation revolution, here are five important facts about GU24 bulbs to keep in mind:

1. Not Manufacturer Specific

GU24 lamps were designed to be better than the pin-based bulbs they’re replacing, so naturally replacement was a feature that had to be corrected. Unlike pin-based light bulbs, GU24 lamps can be replaced with bulbs from any manufacturer as long as the fixture has a GU24 socket. This not only makes replacement easier, but this allows you to shop around for the best bulbs without worrying if you’ll be able to easily replace the bulb you have.

2. Ballast: Already Attached and Easily Replaced
Another attempt to correct pin-based compact florescent lamps (CFLs) was to design GU24 lamps with the ballast already attached. The ballast is an electrical device for starting and controlling fluorescent and discharge lamps and is easily replaced.

3. Adaptable to Standard Base Fixtures
Standard base fixtures, or lamps (not to be confused for light bulbs/lamps), are still considered standard because while incandescent bulbs are disappearing, standard base fixtures are not. To make the transition from incandescent to CFL easier, GU24 bulbs can be plugged into an adapter that will fit any standard base fixture.

4. Available in All Color Temperatures
Whether you need the bright lights of Hollywood or the low lighting of a romantic meal, there’s a GU24 lamp for that. They are available in all color temperatures:

  • 27000K – Warm white
  • 3500K – Soft white
  • 4100K – Cool white
  • 5000K – Daylight

5. Reduce Energy Consumption and Lighting Costs
There are a few reasons why incandescent light bulbs are disappearing. Aside from the fact that they:

  • give off 90% heat and only 10% light
  • have a short life span
  • use 60-100 watts of power each to light a home

Incandescent light bulbs use up 25-30% more energy than even the federal government is comfortable with. By comparison, GU24 bulbs:

  • give off 100% light
  • have a lifespan of 10,000 hours or more
  • use only 13-27 watts of power each

By using less energy to achieve the the same or even better lighting results, GU24 lamps are a sound option for cost-effective, energy resourceful lighting.



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Are the pin based bulb interchangeable from one manufacturer to another

This is a question that is posed to our customer service quite frequently.
Unfortunately there is no short yes or no answer.

For the most part, if you are matching up the pin-base and the wattage, bulbs should be interchangable regardless of manufacturer.

It’s straightforward with bulbs like four pin, G24q-3 base. If you match that information up exactly, they should be interchangeable.

It’s much harder with 2 C circular bulbs because different manufacturers will align the pins slightly differently.

Some manufacturers don’t publish a “base type”, which makes matching bulbs nearly impossible. It’s very difficult, for example, to match up Lights of America to other brands successfully.

The future of lighting is the GU24 base, which is completely interchangable regardless of manufacturer. A nice thing about this design is that if the fixture takes a 26w bulb, you can use any GU24 bulb with an wattage bulb equal to *or less than* 26w.


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Why does this Pin Based Lamp not fit my fixture?

I’ve heard this twice last week. Friends and customers had purchased a pin based bulb and tried to replace their existing burned out bulb.
When they inserted the lamp into the fixture it wouldn’t go in. The fixture seemed the right size and shape but the pins were the wrong size and wouldn’t go in to the socket.

What’s going on they asked me? One had a 2D lamp and they other had a 4 pin quad lamp. Although different styles of bulbs, they were both pin based. The answer for both of them had to do with the lamp being the wrong wattage. Pin Based lamps have one disadvantage: they are wattage dependent. So you have to put a lamp of the same size wattage into the fixture. If you want a different wattage e.g. going from 55W to 38W, you will have to change out the fixture. So in the case of the friend with the 2D Lamp, she needed to put in a 55W 2D bulb not a 38W.

This is an issue you don’t face with GU24 fixtures. It’s easy to swap out a bulb of a different wattage. See last week’s post on the advantages of GU24 base bulbs.