This is a very common light bulb when it comes to applications were a lot of light is desired in a very small space.  It is sometimes known as a high-intensity bulb and many people refer to it as such. It's a little unusual in that it has an intermediate base which is also known as in E17 base.  This fits into certain types of light fixtures which are usually associated with things like furniture or possibly china cabinets or applications that are similar to that.  It's been a popular choice of these kinds of manufacturers for many decades and continues to be used in those type of applications where this bright, intense light needs to be used.  Sometimes it's the only thing that can properly highlight what you need to show or display.  The internal parts have an unusual filament structure as well, which creates a lot of light in such a small space.  The reason people often choose the 40S11 high intensity light bulbs are because of it's very small size and short overall length as well.  The wattage is 40 watt and sometimes called the 40S11/N where the "N" stands for intermediate base.  Although the intermediate is the most popular size of base, there is also a candelabra base available as well for those particular applications that are a little more unusual.  The most common you will find is the one we describe here.  An S11 size denotes a round bulb shape and these come in clear most of the time, but we also have the frosted version as well. 

For most furniture cabinets, they are used in recessed lighting with a 2 inch opening and can be dimmed with a standard incandescent dimmer.  In many types of lighting applications, the dimming capability is what makes it a wonderful choice for things that you may be highlighting adding an extra level of expression.  The places where the 40S11 high intensity light bulbs can be used are endless and sometimes even includes  table lamps as a popular option.  Almost anywhere that a small lamp is required with an intermediate base, the 40S11 light is a great choice. They're really not that expensive and so you can stack up if you have areas were use these a lot.  Unlike some suppliers we have these in both 120 volt and 130 volt versions.  The 130 volt 40S11 will give you longer life than the other because it protects against power surges but the white will be slightly dimmer.  That's typical of anything that has a 130 volt rating that you use in a 120 volt circuit.

Remember that there are a couple of types of incandescent 40S11 high intensity light bulbs, we describe some of the most common used in home and commercial lighting here.  The brands we have are the Sylvania and Westinghouse versions.  Whatever type you have, you will be getting a longer life incandescent than what you're used to, getting the most light you can for your money.  We have a large inventory of incandescent flood light bulbs for nearly every type of light fixture in the field.  This means that you'll never have to be without the right light bulb, especially these types of more uncommon ones.  If you need help identifying an incandescent bulb, our customer service representatives can help you determine what you have.