I use them and don't switch them out until past the one year mark with no issues.. Mind you I'm going the opposite direction with the same end bulb I am currently running the 20k bulbs and am moving down to the 14k range I think with my t5s it's a touch too blue so I'm going to try the 14k and supliment with the t5's and see if I can achieve what I'm looking for color wise.
Keep in mind that yes eBay is a great price and I think they are a decent bulb. Sure they are not Phoenix or higher end but I had a box that came from Calgary or Edmonton when I bought one of my fixtures and wherever they bought thier Artemis bulbs from there they where charges 69.00 per bulb vrs the eBay where I am getting 3 bulbs for 69.00 well worth it to go eBay. Besides I'm a self proclaimed cheap bastard and even if I had to change them every 6 to 8 months eBay is still cheaper
Just my humble .05 (since the penny doesn't exist even my thoughts cost more lol )
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