Krypton / Xenon Light Bulbs

T3 and T4 krypton/xenon light bulbs are available with either frosted or clear glass envelopes and different type bases. These krypton/xenon lamps can be used in chandeliers, outdoor lighting, sconces, vanity fixtures, portables, ceiling fixtures, and other lighting systems. Krypton/xenon bulbs contain both krypton and xenon gas to increase lamp life, produce a higher lumen output at a lower wattage, and provide a bright white light similar to a halogen bulb.

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Krypton/Xenon Light Bulbs FAQS

Basic Makeup

Q) What makes a light bulb a krypton/xenon light bulb?

A mixture of krypton and xenon gases has been introduced into the glass envelope of the light bulb.

Q) Why add a mixture of krypton and xenon gas to the other gases inside the glass envelope of a light bulb?

A) When compared to similar halogen lamps the krypton/xenon light bulbs have a longer rated life, are a bit cooler to the touch, emit no UV rays, have a wider range of dimmability, and are more energy efficient.

Q) How are krypton/xenon light bulbs and xenon light bulbs different?

A) Krypton/xenon lamps contain both krypton and xenon gas while xenon lamps do not contain krypton gas in the glass envelope. Krypton/xenon lamps emit a brighter white light that is similar to halogen lamps whereas xenon lamps emit a light that is slightly warmer in appearance.

Rated Life

Q) What is the rated life of krypton/xenon light bulbs?

Depending on the conditions under which it is being operated the rated life is expected to be around 3,000 hours.

Q) What does the term, “rated life”, of a light bulb mean?

The “rated life” of a lamp signifies the time at which 50% of a large quantity of these lamps will have burned out. This means that 50% of these lamps will burn out before the “rated life” and 50% will burn out after the “rated life”. The “rated life” does not mean that every one of the lamps will last at least that long.

Q) Is this definition of “rated life” true for all types of light bulbs or just krypton/xenon light bulbs?

Yes, this is the standard definition of “rated life” for all lamps.


Q) How does a krypton/xenon light bulb create light?

Like any incandescent light bulb, it creates light by passing electricity through a filament until the filament reaches the point of “incandescence”, the point at which the filament gives off light in addition to heat.

Q) Do I have to be concerned about touching a cool krypton/xenon light bulb with my bare hands?

No. Unlike some halogen lamps, krypton/xenon lamps may be handled with bare hands without experiencing premature lamp failure. [Caution: always wait for the xenon lamp to cool down before touching it.]

Q) Can I replace some of my incandescent or halogen light bulbs with comparable krypton/xenon light bulbs?

Yes, as long as the krypton/xenon lamp has the same wattage rating, the same voltage rating, the same type of base (candelabra, mini-candelabra, double contact bayonet, medium, or double-ended) as the incandescent or halogen lamp, and has a shape and size that can fit into the light fixture in question.

Q) Are krypton/xenon light bulbs relatively cool to operate?

They are cooler to the touch than similar halogen lamps but definitely not as cool as fluorescent lamps. Line voltage (120 volts) krypton/xenon lamps operate especially cooler than line voltage halogen lamps, which can become extremely hot.

Q) Are krypton/xenon light bulbs considered to be energy efficient?

Yes when compared to similar halogen lamps. 

Q) Do krypton/xenon light bulbs require a ballast to operate?


Q) Do krypton/xenon light bulbs require a transformer to operate?

Only low voltage lamps rated at 12 volts or 24 volts require a transformer to operate.

Type of Light

Q) What “kind of light” is given off by krypton/xenon light bulbs?

These lamps provide light very similar to halogen lamps. Light from halogen lamps is often described as a “crisp, white light”, light that is a bit cooler in appearance than the light coming from a xenon lamp.

Q) Do krypton/xenon light bulbs provide good color rendition of the objects they are lighting?

Absolutely. They are considered to have a color rendering index (CRI) of 100, which is considered perfect – like the sun.


Q) Are krypton/xenon light bulbs dimmable?


Q) Will dimming a krypton/xenon light bulb reduce the amount of energy it consumes?

Absolutely, just like xenon lamps.

Q) Will dimming increase its average life?


Q) What kind of dimmer should be used?

Since all of our krypton/xenon lamps operate with line voltage (120 volts), they are fully dimmable with a standard line voltage dimmer.