1. What does “GLS bulb” mean? What’s A19 or G60 bulb?

“GLS bulb” stands for General Lighting Service bulb. It used to refer to incandescent lamps traditionally found around home, but nowadays Led lamp with similar shape & function can be also called as a “GLS bulb”. There is another interpretation of “GLS bulb”, which is Globe Light Source, it actually means the same thing.

A19 bulb, is often mentioned in North America. It’s same thing like G60 bulb, which is mostly mentioned in European countries. They both are one classic type of light bulb that has been the most commonly used type for general-purpose lighting applications since the early 20th century. It has a pear-like shape and an Edison screw (E26 or E27 usually) base. The number 19 after the “A” refers to the width of the bulb in one-eighth inch units, which is 2 ³⁄₈ inches or 60.325mm wide at its widest point. While, the number 60 after the “G” refers to the width of the bulb as well, but in a different unit, milimeter. A19 bulb, or G60 bulb are most popular & common GLS bulb.

And, the most commonly used bases of GLS bulbs, are E26 (in North America), E27 (in most European & Asian countries), and B22 (in UK and some others).

2. What does E26 or E27 mean?

The “E” in E26/E27 means a Edison Screw socket, which is a system of screw mounts used for light bulbs, developed by Thomas Edison. The bulb has a threaded metal base which screws into a matching socket. Most have a right-hand threading that tightens when the lamp is turned clockwise.

The numbers after “E” refers to the diameter in millimeters, i.e. E12 has a diameter of 12 mm. This is different with the bulb glass size which in the U.S. is given in eighths of an inch (i.e. T8/T5, MR16, PAR30/PAR38).  Most common sizes of Edison-screw sockets used for  light bulbs are,

• Candelabra:  E11 in Europe, E12 in North America
  
• Intermediate: E14 (Small ES, SES) in Europe, and E17 in North America
• Medium or standard: E27 (ES) in Europe & some Asian countries, E26 (MES) in North America
• Mogul: E39 in North America, E40 (Goliath ES) in Europe.

Edison-screw base,  typical E27 incandescent lamp

3. What does B22 mean?

The “B” in B22 means a bayonet-cap socket, which is the standard fitting in many former members of the British Empire, including the United Kingdom, Australia, India, and New Zealand, as well as parts of the Middle East and Africa. The number after “B” refers to the diameter of the base, i.e. BA22 is a 22mm diameter bayonet cap.

Bayonet cap, typical B22 incandescent lamp

4. Why to replace A19/G60 incandecent or CFL GLS lamp with A19/G60 Led GLS lamp/bulb?

There are many reasons to replace A19/G60 incandescent or CFL lamp with A19/G60 GLS Led lamp/bulb, including, but not limited to,

• Money saving.  A19/G60 GLS led lamp boasts 75% energy savings and lasts 30 times longer than traditional A19/G60 GLS incandescent lamp, while delivering same luminous level as A19/G60 GLS incandescent lamp does. This means tremendous savings on electricity bill, and replacement/maintenance costs. Our GLS Led Bulb A19 /G60 11W 180°, as direct replacement, is equivalent to 60W GLS incandescent lamp. Or, if you prefer large angle light bulb, you can also choose our GLS Led Bulb A19/G60 9W 330°.
• Energy saving & Proteching the environment.  Consuming less power means reducing carbon emissions, it’s good for environment protection. Morover, our A19/G60 GLS Led lamp does not contain any toxic material, which is harmful to our earth.
• Safer handling & easy usage.  You need not worry any more on toxic materials, and fragile glass/quartz during handling.  With same bases like A19/G60 GLS incandescent bulb, the replacement is very easy.

5. How to replace A19/G60 incandecent or CFL GLS lamp with A19/G60 GLS Led lamp/bulb?

Our A19/G60 GLS Led lamp/bulb has standard E26 base (for North American market), or E27 base(European market), or B22 base(British market), and directly works with the mains voltage (120V AC or 240V AC). So, what we you need do is just to take off the traditonal GLS incandescent or CFL lamp, and install a A19/G60 GLS Led lamp directly, very easy.

We have now TWO major series of A19/G60 GLS Led lamps/bulbs.

Series ONE:   A19/G60 GLS Bulb 180° (Medium Beam angle), 60mm global, with Seoul LED (CRI>80)

• GLS Led bulb, A19/G60 7W 180° ==> up to 580lm, equvalent to 40W GLS incandescent lamp
• GLS Led bulb, A19/G60 9W 180° ==> up to 760lm, equvalent to 50W GLS incandescent lamp
• GLS Led bulb, A19/G60 11W 180° ==> up to 880lm, equvalent to 60W GLS incandescent lamp

Series TWO:   A19/G60 GLS Bulb 330° (Large Beam Angle), 60mm global, with Seoul LED (CRI>80)

• GLS Led bulb, A19/G60 7W 330° ==> up to 620lm, equvalent to 40W GLS incandescent lamp
• GLS Led bulb, A19/G60 8W 330° ==> up to 750lm, equvalent to 50W GLS incandescent lamp
• GLS Led bulb, A19/G60 9W 330° ==> up to 880lm, equvalent to 60W GLS incandescent lamp