New LEDs OK for split sec then off - OK if replace 1 with Halogen

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Old 10-04-19, 01:27 PM
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New LEDs OK for split sec then off - OK if replace 1 with Halogen

So I have a light fitting with 5 halogen bulbs (2 had blown) - G4 fitting. I replaced them all with quality (Philips) LED bulbs. The lights switched on for a split second then switched off. If I replace one of the LEDs with an original Halogen ALL the lights work fine! NB not a dimmer switch!

I've had something similar using cheaper LEDs where I had to mix brands of LEDs together to get them to work properly without flickering or at all. Can anyone suggest what might be going on please? Why is finding and using reliable LED bulbs so finicky?!!!
 
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Old 10-04-19, 04:56 PM
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Welcome to the forums.

Were your old incandescent bulbs 12v. ?
If yes.... there is a driver in that fixture that is designed to operate into a certain load. If it had been designed to run with incandescent..... the LED's don't draw nearly the same power plus the startup load they present to the driver is completely different.

You would need to get the part number off the driver for us to offer further information.
 
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Old 10-05-19, 06:29 AM
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Please provide manufacturer and model number of old halogens and new LEDs.
 
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Old 10-07-19, 03:27 AM
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The old bulbs have no markings on them. I assume they're "simply" 20W (maybe 10W but unlikely) Halogen. The light fitting has 5 bulbs - hence 5 would total 100W. I assume the driver is integrated into the fitting - which I haven't removed to check.

The new bulbs are Philips 1.2W 2700K (bar code 8718696578216).

So is the issue probably that LEDs simply draw too little current for the drivers to work? In which case is a good solution to keep one Halogen bulb in each fitting (if I don't want to replace the driver!)?
 

Last edited by Jonathan West; 10-07-19 at 04:18 AM.
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Old 10-07-19, 08:51 PM
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So is the issue probably that LEDs simply draw too little current for the drivers to work?
Exactly. The minimum is usually stamped on the ID plate. One standard bulb is fine.
 
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Old 10-08-19, 04:10 AM
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Thanks - that makes perfect sense.
 
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