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	  <link:definition>00000056 - Disclosure - Compensatory Equity Incentive Plan and Other Equity Incentives (Details 3)</link:definition>
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	  <link:definition>00000057 - Disclosure - Compensatory Equity Incentive Plan and Other Equity Incentives (Details 4)</link:definition>
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	  <link:usedOn>link:calculationLink</link:usedOn>
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	  <link:definition>00000058 - Disclosure - Compensatory Equity Incentive Plan and Other Equity Incentives (Details 5)</link:definition>
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	  <link:usedOn>link:calculationLink</link:usedOn>
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	  <link:definition>00000059 - Disclosure - Earnings Per Share (Details)</link:definition>
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	  <link:usedOn>link:calculationLink</link:usedOn>
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	  <link:usedOn>link:calculationLink</link:usedOn>
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	  <link:definition>00000061 - Disclosure - Lease Commitments (Details Narrative)</link:definition>
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	  <link:usedOn>link:calculationLink</link:usedOn>
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	  <link:usedOn>link:calculationLink</link:usedOn>
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	  <link:usedOn>link:calculationLink</link:usedOn>
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	  <link:definition>00000064 - Disclosure - Significant Suppliers and Customers (Details Narrative)</link:definition>
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	  <link:usedOn>link:calculationLink</link:usedOn>
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	  <link:usedOn>link:calculationLink</link:usedOn>
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	  <link:usedOn>link:calculationLink</link:usedOn>
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	  <link:usedOn>link:calculationLink</link:usedOn>
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	  <link:usedOn>link:calculationLink</link:usedOn>
	  <link:usedOn>link:definitionLink</link:usedOn>
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	<link:roleType roleURI="http://lightpath.com/role/DerivativeFinancialInstrumentsDetails1" id="DerivativeFinancialInstrumentsDetails1">
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	  <link:usedOn>link:calculationLink</link:usedOn>
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	  <link:usedOn>link:calculationLink</link:usedOn>
	  <link:usedOn>link:definitionLink</link:usedOn>
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	  <link:usedOn>link:calculationLink</link:usedOn>
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	  <link:definition>00000072 - Disclosure - License of GRADIUM Intellectual Property (Details Narrative)</link:definition>
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	  <link:usedOn>link:calculationLink</link:usedOn>
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    <element id="LPTH_InventoriesNetDetailsAbstract" name="InventoriesNetDetailsAbstract" abstract="true" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="LPTH_PropertyAndEquipmentNetDetailsNarrativeAbstract" name="PropertyAndEquipmentNetDetailsNarrativeAbstract" abstract="true" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="LPTH_PropertyPlantAndEquipmentAbandonmentWriteOff" name="PropertyPlantAndEquipmentAbandonmentWriteOff" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="LPTH_PropertyAndEquipmentNetDetailsAbstract" name="PropertyAndEquipmentNetDetailsAbstract" abstract="true" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="LPTH_IntangibleAssetsNetDetailsNarrativeAbstract" name="IntangibleAssetsNetDetailsNarrativeAbstract" abstract="true" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="LPTH_IntangibleAssetsNetDetailsAbstract" name="IntangibleAssetsNetDetailsAbstract" abstract="true" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="LPTH_IntangibleAssetsNetDetails1Abstract" name="IntangibleAssetsNetDetails1Abstract" abstract="true" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="LPTH_AccountsPayableDetailsNarrativeAbstract" name="AccountsPayableDetailsNarrativeAbstract" abstract="true" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="LPTH_StockholdersEquityDetailsNarrativeAbstract" name="StockholdersEquityDetailsNarrativeAbstract" abstract="true" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="LPTH_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRightsAdjusted" name="ClassOfWarrantOrRightExercisePriceOfWarrantsOrRightsAdjusted" nillable="true" xbrli:periodType="instant" type="us-types:perUnitItemType" substitutionGroup="xbrli:item" />
    <element id="LPTH_DebentureConversionPercentage" name="DebentureConversionPercentage" nillable="true" xbrli:periodType="instant" type="num:perShareItemType" substitutionGroup="xbrli:item" />
    <element id="LPTH_ClassOfWarrantOrRightNumberOfSecuritiesIssuedUponExercise" name="ClassOfWarrantOrRightNumberOfSecuritiesIssuedUponExercise" nillable="true" xbrli:periodType="duration" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
    <element id="LPTH_IncomeTaxesDetailsNarrativeAbstract" name="IncomeTaxesDetailsNarrativeAbstract" abstract="true" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="LPTH_FutureIncomeNecessaryToFullyRealizeDeferredTaxAsset" name="FutureIncomeNecessaryToFullyRealizeDeferredTaxAsset" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="LPTH_IncomeTaxesDetailsAbstract" name="IncomeTaxesDetailsAbstract" abstract="true" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="LPTH_CompensatoryEquityIncentivePlanAndOtherEquityIncentivesDetailsNarrativeAbstract" name="CompensatoryEquityIncentivePlanAndOtherEquityIncentivesDetailsNarrativeAbstract" abstract="true" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="LPTH_ESOPCompensationPercentageThreshold" name="ESOPCompensationPercentageThreshold" nillable="true" xbrli:periodType="duration" type="num:percentItemType" substitutionGroup="xbrli:item" />
    <element id="LPTH_ESOPPercentageMarketValue" name="ESOPPercentageMarketValue" nillable="true" xbrli:periodType="duration" type="num:percentItemType" substitutionGroup="xbrli:item" />
    <element id="LPTH_YearlyLimitOnPurchaseOfCommonStockValue" name="YearlyLimitOnPurchaseOfCommonStockValue" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="LPTH_YearlyLimitOnPurchaseOfCommonStockShares" name="YearlyLimitOnPurchaseOfCommonStockShares" nillable="true" xbrli:periodType="instant" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
    <element id="LPTH_EmployeeStockOwnershipPlanESOPDiscount" name="EmployeeStockOwnershipPlanESOPDiscount" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="LPTH_FairValueForfeitureRateOptions" name="FairValueForfeitureRateOptions" nillable="true" xbrli:periodType="duration" type="num:percentItemType" substitutionGroup="xbrli:item" />
    <element id="LPTH_FairValueForfeitureRateRSUs" name="FairValueForfeitureRateRSUs" nillable="true" xbrli:periodType="duration" type="num:percentItemType" substitutionGroup="xbrli:item" />
    <element id="LPTH_FairValueForfeitureRateRSUsDirectors" name="FairValueForfeitureRateRSUsDirectors" nillable="true" xbrli:periodType="duration" type="num:percentItemType" substitutionGroup="xbrli:item" />
    <element id="LPTH_ShareBasedCompensationArrangementByShareBasedPaymentAwardRSUsExercisesInPeriodTotalIntrinsicValue" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardRSUsExercisesInPeriodTotalIntrinsicValue" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="LPTH_CompensatoryEquityIncentivePlanAndOtherEquityIncentivesDetailsAbstract" name="CompensatoryEquityIncentivePlanAndOtherEquityIncentivesDetailsAbstract" abstract="true" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="LPTH_CompensatoryEquityIncentivePlanAndOtherEquityIncentivesDetails1Abstract" name="CompensatoryEquityIncentivePlanAndOtherEquityIncentivesDetails1Abstract" abstract="true" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="LPTH_CompensatoryEquityIncentivePlanAndOtherEquityIncentivesDetails2Abstract" name="CompensatoryEquityIncentivePlanAndOtherEquityIncentivesDetails2Abstract" abstract="true" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="LPTH_StockOptionsAbstract" name="StockOptionsAbstract" abstract="true" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="LPTH_SharesUnexercisableBalanceEnding" name="SharesUnexercisableBalanceEnding" nillable="true" xbrli:periodType="instant" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
    <element id="LPTH_WeightedAverageExercisePriceUnexercisableBalanceEnding" name="WeightedAverageExercisePriceUnexercisableBalanceEnding" nillable="true" xbrli:periodType="instant" type="num:perShareItemType" substitutionGroup="xbrli:item" />
    <element id="LPTH_SharebasedCompensationArrangementBySharebasedPaymentAwardGrantedWeightedAverageRemainingContractualTerm1" name="SharebasedCompensationArrangementBySharebasedPaymentAwardGrantedWeightedAverageRemainingContractualTerm1" nillable="true" xbrli:periodType="duration" type="xbrli:durationItemType" substitutionGroup="xbrli:item" />
    <element id="LPTH_SharebasedCompensationArrangementBySharebasedPaymentAwardExercisedWeightedAverageRemainingContractualTerm1" name="SharebasedCompensationArrangementBySharebasedPaymentAwardExercisedWeightedAverageRemainingContractualTerm1" nillable="true" xbrli:periodType="duration" type="xbrli:durationItemType" substitutionGroup="xbrli:item" />
    <element id="LPTH_SharebasedCompensationArrangementBySharebasedPaymentAwardCancelledWeightedAverageRemainingContractualTerm1" name="SharebasedCompensationArrangementBySharebasedPaymentAwardCancelledWeightedAverageRemainingContractualTerm1" nillable="true" xbrli:periodType="duration" type="xbrli:durationItemType" substitutionGroup="xbrli:item" />
    <element id="LPTH_WeightedAverageRemainingContractLifeUnexercisableBalanceEnding1" name="WeightedAverageRemainingContractLifeUnexercisableBalanceEnding1" nillable="true" xbrli:periodType="duration" type="xbrli:durationItemType" substitutionGroup="xbrli:item" />
    <element id="LPTH_RestrictedStockUnitsAbstract" name="RestrictedStockUnitsAbstract" abstract="true" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="LPTH_WeightedAverageRemainingContractLifeGranted" name="WeightedAverageRemainingContractLifeGranted" nillable="true" xbrli:periodType="duration" type="xbrli:durationItemType" substitutionGroup="xbrli:item" />
    <element id="LPTH_WeightedAverageRemainingContractLifeBalanceEnding" name="WeightedAverageRemainingContractLifeBalanceEnding" nillable="true" xbrli:periodType="duration" type="xbrli:durationItemType" substitutionGroup="xbrli:item" />
    <element id="LPTH_WeightedAverageRemainingContractLifeUnexercisableBalanceEnding" name="WeightedAverageRemainingContractLifeUnexercisableBalanceEnding" nillable="true" xbrli:periodType="duration" type="xbrli:durationItemType" substitutionGroup="xbrli:item" />
    <element id="LPTH_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageGrantDateFairValue" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsOutstandingWeightedAverageGrantDateFairValue" nillable="true" xbrli:periodType="instant" type="num:perShareItemType" substitutionGroup="xbrli:item" />
    <element id="LPTH_TotalAbstract" name="TotalAbstract" abstract="true" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="LPTH_WeightedAverageFairValue" name="WeightedAverageFairValue" nillable="true" xbrli:periodType="duration" type="num:perShareItemType" substitutionGroup="xbrli:item" />
    <element id="LPTH_CompensatoryEquityIncentivePlanAndOtherEquityIncentivesDetails3Abstract" name="CompensatoryEquityIncentivePlanAndOtherEquityIncentivesDetails3Abstract" abstract="true" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="LPTH_CompensatoryEquityIncentivePlanAndOtherEquityIncentivesDetails4Abstract" name="CompensatoryEquityIncentivePlanAndOtherEquityIncentivesDetails4Abstract" abstract="true" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="LPTH_UnexercisableUnvestedAwardsAbstract" name="UnexercisableUnvestedAwardsAbstract" abstract="true" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="LPTH_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsUnexercisableNumber" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsUnexercisableNumber" nillable="true" xbrli:periodType="instant" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
    <element id="LPTH_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsUnexercisableNumbeGranted" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsUnexercisableNumbeGranted" nillable="true" xbrli:periodType="duration" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
    <element id="LPTH_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsUnexercisableNumbeVested" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsUnexercisableNumbeVested" nillable="true" xbrli:periodType="duration" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
    <element id="LPTH_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsUnexercisableNumbeCancelledForfeited" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsUnexercisableNumbeCancelledForfeited" nillable="true" xbrli:periodType="duration" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
    <element id="LPTH_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValueAbstract" name="ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValueAbstract" abstract="true" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="LPTH_CompensatoryEquityIncentivePlanAndOtherEquityIncentivesDetails5Abstract" name="CompensatoryEquityIncentivePlanAndOtherEquityIncentivesDetails5Abstract" abstract="true" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="LPTH_ShareBasedCompensationGA" name="ShareBasedCompensationGA" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="LPTH_ShareBasedCompensationCOS" name="ShareBasedCompensationCOS" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="LPTH_ShareBasedCompensationRD" name="ShareBasedCompensationRD" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="LPTH_EarningsPerShareDetailsAbstract" name="EarningsPerShareDetailsAbstract" abstract="true" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="LPTH_DefinedContributionPlanDetailsNarrativeAbstract" name="DefinedContributionPlanDetailsNarrativeAbstract" abstract="true" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="LPTH_LeaseCommitmentsDetailsNarrativeAbstract" name="LeaseCommitmentsDetailsNarrativeAbstract" abstract="true" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="LPTH_LeaseCommitmentsDetailsAbstract" name="LeaseCommitmentsDetailsAbstract" abstract="true" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="LPTH_CapitalLeaseImputedInterest" name="CapitalLeaseImputedInterest" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="LPTH_ForeignOperationsDetailsNarrativeAbstract" name="ForeignOperationsDetailsNarrativeAbstract" abstract="true" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="LPTH_SignificantSuppliersAndCustomersDetailsNarrativeAbstract" name="SignificantSuppliersAndCustomersDetailsNarrativeAbstract" abstract="true" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="LPTH_ConvertibleDebenturesDetailsNarrativeAbstract" name="ConvertibleDebenturesDetailsNarrativeAbstract" abstract="true" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="LPTH_PercentOfWarrantsOutstanding" name="PercentOfWarrantsOutstanding" nillable="true" xbrli:periodType="instant" type="num:percentItemType" substitutionGroup="xbrli:item" />
    <element id="LPTH_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1" name="ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1" nillable="true" xbrli:periodType="instant" type="us-types:perUnitItemType" substitutionGroup="xbrli:item" />
    <element id="LPTH_DebenturesHoldingRelatedParty" name="DebenturesHoldingRelatedParty" nillable="true" xbrli:periodType="instant" type="num:percentItemType" substitutionGroup="xbrli:item" />
    <element id="LPTH_ConversionIncentiveShares" name="ConversionIncentiveShares" nillable="true" xbrli:periodType="duration" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
    <element id="LPTH_BbeBeneficialOwnershipLimitationThreshold" name="BbeBeneficialOwnershipLimitationThreshold" nillable="true" xbrli:periodType="instant" type="num:percentItemType" substitutionGroup="xbrli:item" />
    <element id="LPTH_ConvertibleDebenturesDetailsAbstract" name="ConvertibleDebenturesDetailsAbstract" abstract="true" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="LPTH_PrivateCommonStockPlacementsDetailsNarrativeAbstract" name="PrivateCommonStockPlacementsDetailsNarrativeAbstract" abstract="true" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="LPTH_AmountLoweredByExercisePriceAdjustment" name="AmountLoweredByExercisePriceAdjustment" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="LPTH_PotentialProceedsFromExerciseOfWarrants" name="PotentialProceedsFromExerciseOfWarrants" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="LPTH_DerivativeFinancialInstrumentsDetailsAbstract" name="DerivativeFinancialInstrumentsDetailsAbstract" abstract="true" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="LPTH_GreaterOfEstimatedStockPriceOrFloor" name="GreaterOfEstimatedStockPriceOrFloor" nillable="true" xbrli:periodType="duration" type="num:perShareItemType" substitutionGroup="xbrli:item" />
    <element id="LPTH_ProbabilityPriceStrike" name="ProbabilityPriceStrike" nillable="true" xbrli:periodType="duration" type="num:percentItemType" substitutionGroup="xbrli:item" />
    <element id="LPTH_DerivativeFinancialInstrumentsDetails1Abstract" name="DerivativeFinancialInstrumentsDetails1Abstract" abstract="true" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="LPTH_Level3InputsActivityAbstract" name="Level3InputsActivityAbstract" abstract="true" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="LPTH_WithdrawnFinancingPlanDetailsNarrativeAbstract" name="WithdrawnFinancingPlanDetailsNarrativeAbstract" abstract="true" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="LPTH_OwnershipUnitsIntendedForSale" name="OwnershipUnitsIntendedForSale" nillable="true" xbrli:periodType="duration" type="xbrli:integerItemType" substitutionGroup="xbrli:item" />
    <element id="LPTH_StockIncludedInEachOwnershipUnit" name="StockIncludedInEachOwnershipUnit" nillable="true" xbrli:periodType="duration" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
    <element id="LPTH_WarrantsIncludedInEachOwnershipUnit" name="WarrantsIncludedInEachOwnershipUnit" nillable="true" xbrli:periodType="duration" type="xbrli:sharesItemType" substitutionGroup="xbrli:item" />
    <element id="LPTH_PrepaidOfferingCostsWrittenOff" name="PrepaidOfferingCostsWrittenOff" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="LPTH_DeferredRevenuecostsInExcesOfBillingsDetailsNarrativeAbstract" name="DeferredRevenuecostsInExcesOfBillingsDetailsNarrativeAbstract" abstract="true" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
    <element id="LPTH_RaytheonContract" name="RaytheonContract" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" type="xbrli:monetaryItemType" substitutionGroup="xbrli:item" />
    <element id="LPTH_LicenseOfGradiumIntellectualPropertyDetailsNarrativeAbstract" name="LicenseOfGradiumIntellectualPropertyDetailsNarrativeAbstract" abstract="true" nillable="true" xbrli:periodType="duration" type="xbrli:stringItemType" substitutionGroup="xbrli:item" />
</schema>
