Replacement Lamp question for a coralife Turbo Twist 6X 18 watts

[nemo14]

Hello everyone i need to buy a spare uv bulb for my coralife urbo Twist 6X  18 watts i see a big price difference some replacements 50 buck all the way up to 150 bucks what the difference? I assume 50 dollar one is an OEM and the 150 dollar one is the real brand for coralife. So my question is whats the difference between the two? Will the OEM last as long as the original one and put out the same amount of power?

Thanks for any info you can give in advance.   

[Rex]

Hi, I have the smaller model (3X 9 watt) and have used two off brand replacement bulbs and one official Coralife. There is no difference in my experience, the Coralife actually burned out on me more quickly then the no name brands.