Knowledge Base

How to bypass the ballast for replacement LED?

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Type of G24D and G24Q

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Type of Light Bulbs

1. A-Lamp
Base: E26
2-A. BR 2-B. R 3. Candelabra
Base: E12
4. Globe 5. PAR-20
6. MR16
Base: GU5.3
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Color Temperatures in the Kelvin Scale

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Measuring Lamps

All lamps have a specific "bulb type" designation that describes the shape of the lamp and the size of the lamp (diameter). The designation is a two part code consisting of a letter and a number. The letter indicates the shape of the lamp and the number relates to the diameter of the lamp in eighths of an inch. The reference ruler at left illustrates the most commonly used household lamp, an A19. The "A" indicates the shape (standard) and the diameter would be 2.38", which is "19" eights of an inch. All lamp types are available in a variety of technologies and therefore may vary in appearance. Maximum overall length (MOL) will also vary. Additional popular lamp designations are also indicated on the reference ruler. Here is a quick guide to shape abbreviations:

  • A          Arbitrary (Standard)
  • R          Reflector
  • MR      Multi-Faceted Reflector
  • BR       Bulbous Reflector
  • PAR    Parabolic Aluminized Reflector
  • G         Globe
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What Is CRI?

High CRI Index / CRI > 90 Typical CRI Index / CRI > 80 Low CRI Index / CRI > 70
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G24q-1 Base

  • Need BYPASS OR REMOVE the ballast, otherwise, it doesn't light on. G24q Series (Female Socket Fixture) to E26 (Male Bulb Base) Adapter - Q series has a shorter tip than D series and is more common in the US.
  • Suit for GX24q-1/GX24q-2/GX24q-3 socket,Physically change the contact, don't change voltage. If you don't know how to remove or don't plan to ask an electrician to remove the ballast, please DO NOT BUY!
  • All pin-based CFL, like GX24Q G24 GX23 G23 are lamp-ballast separated, but all screw-in E26 E27 are lamp-ballast integrated. ballast is a must to start a high voltage(600V-1500V 1ms) to light up the CFL, but it is dangerous for LED Lamp. Because LED Lamp are built with LEDs and Driver which is transforming the 100-240V AC to DC for LEDs. So the LED Driver input should be 100V-240V or 85-265V, so 600-1500V will be too high, and easily destroy the led lamp.
  • There are some LED Driver who can be compatible with the ballast, no LED Driver can be compatible with all the ballast. So the best thing is bypass or remove once we want to change CFL to LED Lamp. When we remove pin-based CFL, we only removed the lamp, the ballast is still working in front fixture; even we change to E26/E27 CFL, there will be 2 ballasts, the light will not work.
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What is THD?

Total Harmonic Distortion (THD) = Distortion of the relationship between line power and load current draw. The Problem with Lighting and SSL Loads – Harmonic Distortion, THD and dimming effects:

While motor loads can generally be PF corrected using capacitors, including applying PF correction strategies to building power systems upstream of individual loads, power factor issues caused by lighting loads using electronic switching cycle power supplies can create high harmonic distortion power factor losses not as easily resolved. For this reason and others, Total Harmonic Distortion (THD) may be as important, or more important than the resulting PF. The relationship between PF and THD are roughly tied together as such: THD = 1-PF². So, the demand for low THD and low PF are actually addressing the same issue. For example, in the previous example, a .50PF product will have a THD of roughly THD of 75%, while a .90PF product will have an estimated THD of 19%. This translates to load on the system in a similar manner that PF does.

While the impact is the same on the power generation end, due to the wide range of individual product characteristics involved, correction of THD losses can only be effectively accomplished at the individual load. THD also has other implications on other systems within the building, so there are other reasons to control this specification as well. However, as it is with PF, the impact of THD on the building and its power system is proportional to the loads involved.

Further, THD is a trickier issue than PF, as there are so many variables in frequency, distortion shape, etc.. that interaction between products can create compound issues on a circuit and building system as a whole, if not fully resolved. For this reason, THD must be corrected at each individual load, to avoid expanding its impact beyond.

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Lamp Wattage Comparison

Incandescent CFL Halogen LED High Pressure Sodium Approximate Lumen Range
12W ~ 15W 1.3W
25W 5W ~ 6W 25W 3W
30W 7W ~ 9W
40W 9W ~ 13W 50W 5W 450lm
60W 13W ~ 15W 60W 7W 800lm
75W 18W ~ 23W 9W 1,100lm
100W 25W ~ 30W 13W 1,600lm
150W 30W ~ 52W 2,600lm
150W 40W
35W 150W ~ 250W 2,500lm
70W 250W ~ 300W 5,000lm
140W 300W ~ 400W 10,000lm
210W 400W ~ 450W 15,000lm
210W 400W ~ 450W 15,000lm
224W 450W ~ 550W 20,000lm
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