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As for the color difference, make sure the "nipple" of the bulb is in the up position on both bulbs. MH's usually take 100-150 hours to "burn in" and attain their true color and intensity.
When you buy bulbs in the future I would suggest looking at other brands. Maybe a local reefer or two has a 150 DE you could borrow and fire up in your fixture next to your current bulb. There's no better way to compare them. Oh, and don't use an 8-12 month old bulb to compare to yours. Try to get them as close to the same age as possible.
Kevin
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