I had the same problem and then I figured out that the Artemis bulbs are shorter and weren't making the contact they needed to in my lights. I tried the 150W and the 70W MH bulbs and both are a bust. When I e-mailed them, they told me that I must be mistaken as no-one else had a problem.
Gone back to the plusrite's form LSE on E-bay. Great bulbs for a great price.
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Mark...
290g Peninsula Display, 425g total volume. Setup Jan 2013.
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