Electrical expert advice/guess needed - The Planted Tank Forum
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post #1 of 5 (permalink) Old 10-18-2006, 12:25 PM Thread Starter
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Electrical expert advice/guess needed

I have 2 identical or at least nearly identical compact lighting units. The only diferances that I can see is that the power in supply and output wires are diferant lengths. Oh, I should say these lighting units have external electronic balists.

The problem I am having is that with one of these units the lights flash for 5-10 minutes after the power is cut by a timer switch. The lights don't flash after I turn of the switch on the power balists itself. I swapped the timers but the problem remain with the same lighting unit.

This flashing is not just a little flicker, it realy flashes quit brightly about twice a second.

This flashing fried the internal fuze, so I had to solder a new one in place.

Any ideas?
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post #2 of 5 (permalink) Old 10-18-2006, 05:03 PM
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Are the timers identical? If so you might want to try a different brand. Its possible there is some interference generated by the one piece of equipment the other doesn't like.

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post #3 of 5 (permalink) Old 10-19-2006, 12:30 PM Thread Starter
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I have additional information. The good unit has a 3 prong plug while the problem unit has a 2 prong plug. I will have to open both units and compare wiring and maybe change the 2 wire out with a 3 wire power plug. the problem could be a grounding issue.
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post #4 of 5 (permalink) Old 10-19-2006, 04:36 PM
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Not all electronic ballasts are electronic ballasts. Some are magnetic ballasts with a few electronic parts. Timers have a hard time controlling lights using magnetic ballasts. Such a ballast makes it hard for the timer to turn the light off. I have fried many digital timers with the "almost electronic" ballast lights. This reads like that is the difference between your lights, in addition to the lack of grounding on one of them, which is most likely the "almost electronic" ballast light.

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post #5 of 5 (permalink) Old 10-20-2006, 12:07 AM Thread Starter
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Hi Hoppy,
I have seen 3 types of ballasts:
1) Large "Self start" magnetic
2) small magnetic transformer with starters
3) Electronic

This is definatly electronic, I had it apart to replace the fuse. Circut board, capactors, resistors and power transistors mounted on heat sync.

I'll try to do this right and write up a little document on these.
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