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Krypton/Xenon

All the light bulbs in this category use krypton and/or xenon as part or all of the gas fill. Most standard incandescent light bulbs are filled with inert argon plus enough nitrogen to suppress arcing between the lead-in wires. Krypton and xenon gas contribute two features that improve the efficacy (or efficiency) of the lamp compared to ones filled with argon. Firstly, both gases have a lower heat conductivity than argon. Secondly, the larger molecule size of both gases retards the evaporation of the tungsten filament and increases bulb life. Xenon is an improvement over krypton for both factors.

Depending on bulb size, type of filament and mixture ratios, adding krypton and xenon gas can increase the efficacy of the lamp by 7% to 20%. Xenon is the more expensive of the two and is used primarily for special application bulbs.

Why Krypton and Xenon Bulbs Have Longer Rated Life

You may have wondered why some bulbs feature krypton or xenon gas. For many years, incandescent bulbs were filled with nitrogen gas. When argon became more affordable, it was substituted for nitrogen because it decreased the rate of evaporation of the tungsten filament and increased bulb life. More recently, krypton or xenon are used in some bulbs in place of argon. Because the molecular size is larger than argon, both these inert gases do a better job of retarding the evaporation of the filament and give longer life to the bulb. Also, since both krypton and xenon have lower heat conductivity than argon, the filament temperature is higher which increases the efficacy of the bulb. Xenon is better than krypton at both of these enhancements, but it is significantly more expensive. These specialty gases are used in filament bulbs where the added cost is justified by the improved performance.

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  1. JC50XE/12/F - 50W 12V Xenon - BI-Pin Base - Frosted
  2. Eiko KPR118 Bulb | 0.55A 7.2V Krypton B3 1/2 SC Miniature Flanged Base
  3. Eiko KPR103 Bulb | 0.75A 3.6V Krypton B3 1/2 SC Miniature Flanged Base
  4. CEC XPR16 Bulb | 0.70A 15.6V Xenon T3 1/4 P13.5s Base
  5. KR25CTC/25 Bulb 25W 120V B8 Incandescent Krypton Candelabra Base Clear
  6. Bulbrite KR60CFC/32 Bulb | 60W 120V CA10 Krypton E12 Base
  7. Bulbrite KR60CTC/32 Bulb | 60W 120V B10 Krypton E12 Base
  8. Eiko 50124 JF07XE | 0.833A 12V Xenon T3 1/4 Clear Rigid Loop Base Bulb
  9. Bulbrite KR10CTC/25 Bulb | 10W 120V B8 Krypton Candelabra Base
  10. CEC XPR18 Bulb | 0.59A 18V T3.25 Single Contact Miniature Flange Base
  11. Bulbrite KR40ETC/32 Bulb | 40W 120V B10 Krypton Medium Base
  12. KPR2 Bulb 2.38V .5A B3-1/2 Krypton Single Contact Mini Flange Base
  13. Standard KPR102 Bulb | 2.4W 2.4V B3.5 Flashlight Bulb - P13.5s Base
  14. 5T31/4X Bulb 5W 12V T3-1/4 Xenon Wedge Base Clear
  15. Bulbrite 715545 XE5F/24 | 5W Xenon Wedge Base Frosted Bulb
  16. Bulbrite 715606 - 5W 24V Festoon - Xenon - Clear
  17. 1211X Bulb 12V .917A T3-1/4 Incandescent (Xenon) Wedge Base
  18. Standard KPR104 Bulb | 1.03W 2.2V B3.5 Flashlight Bulb - P13.5s Base
  19. CEC XPR19 Bulb | 0.60A 19.2V T3.5 Single Contact Miniature Flange Base
  20. Bulbrite KR60G16CL Bulb | 60W G16.5 Krypton - Globe - Candelabra Base

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