Using LED in fixture designed for Halogen

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SUMMARY

The discussion centers on the feasibility of using a 14.4VAC LED bulb in a lighting fixture originally designed for a 250W Halogen bulb (Philips QT8500) powered by 24VAC. It is established that the LED bulb cannot be used in this fixture due to the voltage mismatch; powering a 14.4VAC LED with 24VAC will result in immediate failure of the LED. Additionally, the participant's misunderstanding of Ohm's Law is clarified, emphasizing that current and resistance are distinct concepts.

PREREQUISITES
  • Understanding of electrical concepts, specifically Ohm's Law.
  • Knowledge of AC vs. DC current characteristics.
  • Familiarity with lighting fixtures and their power requirements.
  • Basic understanding of LED technology and its voltage ratings.
NEXT STEPS
  • Research the specifications and compatibility of LED bulbs with existing fixtures.
  • Learn about power supply requirements for LED lighting systems.
  • Explore the differences between AC and DC current in lighting applications.
  • Investigate heat management solutions for LED installations in high-temperature environments.
USEFUL FOR

This discussion is beneficial for lighting designers, electrical engineers, and anyone involved in upgrading or retrofitting lighting systems from halogen to LED technology.

drdream
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Hello,

I have a lighting fixture used in stage and entertainment lighting (HES Trackspot) which was designed to use a 250Watt Halogen bulb (Phillips QT8500). The power supplying the bulb is 24VAC. The bulb has two fans underneath.

I have found a LED bulb with comparable lumen output. The bulb is rated at 14.4VAC @ 6.3amps..

I have found an ohms law calculator which says there is a 1ohm difference between the current.. so I just wanted to know if anyone can chime in on this effort. I also know nothing about power supplies, or if the LED is DC or AC current.. I am just thinking as long as I can hack a heatsink for the LED and the current doesn't blow it up.. it would work?

Thanks
 
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your statement "there is a 1 ohm difference between the current" doesn't make sense since ohms and current are not the same thing at all.

At any rate, no it won't work because if the LED bulbpack is rated for 14V and you power it with 24V, it will surely blow out immediately.
 

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