Search our site
Browse Categories
Helpful tools:
Color Temperatures
Energy Saving Calc
Light Distribution
F20T10 Black Light Bulbs

Price Each: $32.03
Item Number: 27852

F20T10 Black Light Blue bulbs are the typical lamp used for several types of effects including the most common one which is Black Light Blue displays and effects. They're also used for stage lighting effects and nighttime scenes that require a special dark sky effect but have colors that jump out of a display. These are 24" inches long from pin to pin and are the same size as standard T10 lamps that you might use in an office overhead light fixture. The effect is most pronounced when all other visible light sources are turned off, that washes out the effect, so best to use it in total darkness. Like any other 20 watt T10 lamp, this bulb operates on the same magnetic ballast so that you can use this bulb anywhere you have a regular F20T10 fluorescent lamp. That also includes multiple lamp configurations; it doesn't matter. So you can get the great Black Light blue effect with almost any fixture that's on the market today. T10 fluorescent bulbs are probably the most pervasive in every office lighting situation and even for homes. If you need a new fixture to use this light in, we have many T10 light fixtures that will accommodate this bulb. So as long as it operates in F20T10, you're going to be able to use this Black Light Blue bulb. Keep in mind that if you have a larger area, you’re going to need quite a few of these lamps to properly give the Black Light blue effect. You won’t be able to just put one or two lamps in an extensive area and have it do its job. Of course, for smaller spaces, you might be able to get by with a two lamps strip fixture something like that, but for a large area, you’re going to need several light fixtures with these lamps in them. Sometimes people call these purple light bulbs but the effect is not purple, it has a particular area of the spectrum to create the Black Light Blue you need.

Product features:
- 20 watts.
- Operates on electronic ballasts.
- Medium bi-pin base.
- Black Light Blue blue bulbs for various effects.
- Deep purple phosphor when unlit.
- 24-inch overall length including pins.
- F20T10/BLB is one of the ways that these are labeled.
General information.
At, we have a complete line of various types of Black Light Blue, but this is the BLB or Black Light Blue blue version. These are fluorescent bulbs that use a particular phosphor that emits the Black Light Blue effect, or it’s an incandescent bulb that blocks most visible light with a filter creating what is probably a lesser effect. When it comes to the fluorescent tubes, many people will call this an ultraviolet light, and it’s most commonly associated as mentioned before with unique types of special pigments that glow-in-the-dark. For most people, these are used for special display lighting effects, such as a theater production where a dark sky or some background needs to be indicated. It’s also used over Halloween where many people have their homebrewed displays and utilize the paints that that glow when used in conjunction with a BLB bulb. It’s also used where certain types of markings need to be identified in an industrial situation or sometimes with the TSA. All of those commercial applications typically use something that would be a smaller bulb or a CFL.

The specifics, please.
There’s nothing electrically different between these and other types of fluorescent or incandescent bulbs, so you don’t have to make any adjustment with the existing light fixture. There’s no rewiring that’s required or anything like that. Just plug the new bulb in where the old one was, and you’re all set to go. If you need light fixtures that will utilize any of these types, we have many selections for that in different kinds of strip light fixtures, cabinet light fixtures or something that’s maybe more industrial. No matter which way you go with it, you can be assured that this is going to work in any light fixture that has the same code if it’s a fluorescent or incandescent bulb. There are two different versions of this type of bulb; one is a screw-in type which could be an incandescent or a compact fluorescent. The other type is a linear fluorescent which needs to operate on a ballast which is inside the light fixture. There are specific lengths which work for certain types of light fixtures; they’re not all interchangeable.

What's the best Black Light Blue bulb to use?
People often ask what’s the best lighting effect that you can have using a Black Light Blue bulb. Most of the time that would be a linear fluorescent. It gives off the most significant amount of the Black Light blue effect although if you have an extensive area, you’ll have to use several fixtures to get that effect everywhere. You can’t just put one tube somewhere in the room and expected to glow everything with that Black Light blue effect. If you’re unsure about how many that you may need, we can probably help you with that so that you have a successful display or party or whatever you might be doing with this bulb. Right behind the linear fluorescent version ineffectiveness would be the screw-in compact fluorescent flood lights which have the same kind of phosphor. It’s very effective, but it needs to be used in close range as the light output is not high. Probably the least effective is the incandescent version because it’s a filtered Black Light Blue. It does work, and it is low-cost, and for a lot of types of displays, it’s about the color that it’s putting off which is a purple color. But if you want to get that pop of glow that you get with certain types of paints and things like that, this would not be the right one to use.

How can we help you today?
If you’re unsure about what you have and you need a little bit of help, please call or email us with any information you have, and we can help you. We probably have seen everything that’s out there as far as Black Light blue and if it’s something we haven’t noticed we can point you in the right direction. We carry all of these different types of Black Light Blues, and we probably have the one that you need for whatever application that you may have, something commercial or something for display or party.
Shopping Cart
Your cart is empty.

Sales by phone & quantity discounts: 
Call: 866-637-1530
or text: 651-243-1090

For tracking & after sale support, email us at:
Or text: 651-243-1090

We proudly sell many USA made lighting products.