Is there any problem using 65W PC bulbs on a 55W ballast?
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Old 09-06-2006, 05:49 AM   #1
mpb
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Is there any problem using 65W PC bulbs on a 55W ballast?


I need to buy a new PC bulb. I am using 2 55W. One of them burnt out. I will replace both as I want to change the color temperature.
It seems that it is cheaper if I buy a 66W one.
Do I get the same intensity as if I were using a 55W bulb?
Is there any side effect?
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Old 09-06-2006, 02:55 PM   #2
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It appears that the "65W lamp" is a marketing gimic. The actual watage is ballast dependent. Just make sure you use square/straight pins.
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Old 09-06-2006, 05:27 PM   #3
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From my understanding.....which isn't much....

if you use a 65w bulb in a 55w ballast, you get 55watts of light.

if you use a 55w bulb in a 65w ballast, you might be asking for trouble
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Old 09-06-2006, 05:48 PM   #4
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Quote:
Originally Posted by esarkipato View Post
From my understanding.....which isn't much....

if you use a 65w bulb in a 55w ballast, you get 55watts of light.

if you use a 55w bulb in a 65w ballast, you might be asking for trouble
I don't think that's right. I'm no electrician but when I was installing my two separate 55w bright kits from AH supply I noticed that the ballasts can actually push more wattage than 55 watts, around 120 if I remember correctly. Also I've noticed that the 65w bulb are longer than the 55w bulbs so I'm assuming that the wattage is a function of length and that if you're using the AHSupply bright kit ballasts that pushing a 65w bulb instead of 55w shouldn't be a problem at all.

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