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data-bvcsref="http://answers.grainger.com/answers/5049-en_us/product/2V659/subscribeanswers.htm?format=embeddedrpc&contentid=141754&answers=true&user=__USERID__&authsourcetype=__AUTHTYPE__" data-bvtrack="eventTarget:Product,eName:ProductFollow" data-bvcsappcode="qa" name="BV_TrackingTag_Question_Display_SubcribeContent" class="BVDILink BVDI_CSSubmitLink" data-bvcssubjectid="2V659" href="javascript://" data-bvcssubjecttype="product"><span class="BVDILinkSpan">I have this question too</span></a></div></div> <div class="BVQAQuestionAnswerDivider"><h2 class="BVQAQuestionAnswerDividerHeading">Answers </h2></div><div id="BVQAQuestion141754Answers" class="BVQAAnswers"><div id="BVQAAnswer150847" class="BVQAContent BVQAAnswer BVDI_BAContentTop10Contributor"><div class="BVDI_BA BVDI_BAAnswer"><div class="BVDIInside BVDI_BAInside"><div class="BVDIBody BVDI_BABody"><ul class="BVDI_BAList"><li class="BVDI_BAItem BVDI_BAItemOdd BVDI_BAItemContributor BVDI_BAItemTop10Contributor"><a onclick="return 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The "H" indicates the value if the lamp is mounted HORIZONTALLY.<br /><br />The "Mean" is the "average" over the life of the lamp.<br /><br />When mounted VERTICALLY this lamps has an: Initial Lumens of 108,000L; Mean (Average) Lumens of 86,000L; Average Life of 15,000 Hours.<br /><br />When mounted HORIZONTALLY this lamps has an: Initial Lumens of 100,280L; Mean (Average) Lumens of 79,000L; Average Life of 11,000 Hours.<br /><br />Position orientation affects the performance of the lamp.<br /><br />Thank you for using Grainger Ask & Answer.</div><div class="BVQAContentData BVAnswerData"> <div class="BVQAElapsedTime">2 months, 3 weeks ago</div><div class="BVQASignature"><div class="BVQAWrittenBy">by </div><div class="BVQANickname"><a title="Read all my Q&A" data-bvtrack="eName:ProfileLink" onmouseout=" bvProfileSnapshot.hideOpenPopinAfterDelay(1000 ,250 ); " name="BV_TrackingTag_Answer_Display_ReadAllQA_TPSMRLGD" class="BVQANickname" onclick="var popupWin = window.open(this.href, null, 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