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Proc-Type: 2001,MIC-CLEAR
Originator-Name: webmaster@www.sec.gov
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MIC-Info: RSA-MD5,RSA,
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<SEC-DOCUMENT>0000893877-10-000690.txt : 20101209
<SEC-HEADER>0000893877-10-000690.hdr.sgml : 20101209
<ACCEPTANCE-DATETIME>20101209123652
ACCESSION NUMBER:		0000893877-10-000690
CONFORMED SUBMISSION TYPE:	4
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20101208
FILED AS OF DATE:		20101209
DATE AS OF CHANGE:		20101209

ISSUER:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			SemiLEDs Corp
		CENTRAL INDEX KEY:			0001333822
		STANDARD INDUSTRIAL CLASSIFICATION:	SEMICONDUCTORS & RELATED DEVICES [3674]
		IRS NUMBER:				202735523

	BUSINESS ADDRESS:	
		STREET 1:		3F, NO. 11 KE JUNG RD., CHU-NAN SITE
		STREET 2:		HSINCHU SCIENCE PARK, MIAO-LI COUNTY
		CITY:			CHU-NAN
		STATE:			F5
		ZIP:			350
		BUSINESS PHONE:		886-37-586788

	MAIL ADDRESS:	
		STREET 1:		3F, NO. 11 KE JUNG RD., CHU-NAN SITE
		STREET 2:		HSINCHU SCIENCE PARK, MIAO-LI COUNTY
		CITY:			CHU-NAN
		STATE:			F5
		ZIP:			350

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			J.R. Simplot Co
		CENTRAL INDEX KEY:			0001506777
		STATE OF INCORPORATION:			NV
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-34992
		FILM NUMBER:		101241684

	BUSINESS ADDRESS:	
		STREET 1:		999 MAIN STREET, SUITE 1300
		CITY:			BOISE
		STATE:			ID
		ZIP:			83702
		BUSINESS PHONE:		208-336-2110

	MAIL ADDRESS:	
		STREET 1:		999 MAIN STREET, SUITE 1300
		CITY:			BOISE
		STATE:			ID
		ZIP:			83702

REPORTING-OWNER:	

	OWNER DATA:	
		COMPANY CONFORMED NAME:			Simplot Taiwan Inc.
		CENTRAL INDEX KEY:			0001506779
		STATE OF INCORPORATION:			ID
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		4
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	001-34992
		FILM NUMBER:		101241683

	BUSINESS ADDRESS:	
		STREET 1:		999 MAIN STREET, SUITE 1300
		CITY:			BOISE
		STATE:			ID
		ZIP:			83702
		BUSINESS PHONE:		208-336-2110

	MAIL ADDRESS:	
		STREET 1:		999 MAIN STREET, SUITE 1300
		CITY:			BOISE
		STATE:			ID
		ZIP:			83702
</SEC-HEADER>
<DOCUMENT>
<TYPE>4
<SEQUENCE>1
<FILENAME>edgar.xml
<DESCRIPTION>PRIMARY DOCUMENT
<TEXT>
<XML>
<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0303</schemaVersion>

    <documentType>4</documentType>

    <periodOfReport>2010-12-08</periodOfReport>

    <issuer>
        <issuerCik>0001333822</issuerCik>
        <issuerName>SemiLEDs Corp</issuerName>
        <issuerTradingSymbol>LEDS</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001506779</rptOwnerCik>
            <rptOwnerName>Simplot Taiwan Inc.</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>999 MAIN STREET, SUITE 1300</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>BOISE</rptOwnerCity>
            <rptOwnerState>ID</rptOwnerState>
            <rptOwnerZipCode>83702</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001506777</rptOwnerCik>
            <rptOwnerName>J.R. Simplot Co</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>999 MAIN STREET, SUITE 1300</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>BOISE</rptOwnerCity>
            <rptOwnerState>ID</rptOwnerState>
            <rptOwnerZipCode>83702</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>0</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>1</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Class A Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2010-12-08</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>J</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>9899344</value>
                </transactionShares>
                <transactionPricePerShare>
                    <footnoteId id="F1"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>D</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>0</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                    <footnoteId id="F2"/>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
        <nonDerivativeTransaction>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <transactionDate>
                <value>2010-12-08</value>
            </transactionDate>
            <transactionCoding>
                <transactionFormType>4</transactionFormType>
                <transactionCode>J</transactionCode>
                <equitySwapInvolved>0</equitySwapInvolved>
                <footnoteId id="F1"/>
            </transactionCoding>
            <transactionAmounts>
                <transactionShares>
                    <value>9899344</value>
                </transactionShares>
                <transactionPricePerShare>
                    <footnoteId id="F1"/>
                </transactionPricePerShare>
                <transactionAcquiredDisposedCode>
                    <value>A</value>
                </transactionAcquiredDisposedCode>
            </transactionAmounts>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>9899344</value>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                    <footnoteId id="F2"/>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeTransaction>
    </nonDerivativeTable>

    <footnotes>
        <footnote id="F1">Pursuant to a reclassification exempt under Rule 16b-7, each share of Class A Common Stock was reclassified into one share of Common Stock.</footnote>
        <footnote id="F2">All such shares are held by Simplot Taiwan Inc., a wholly-owned subsidiary of J.R. Simplot Company.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>William J. Whitacre, President of Simplot Taiwan Inc.</signatureName>
        <signatureDate>2010-12-09</signatureDate>
    </ownerSignature>

    <ownerSignature>
        <signatureName>William J. Whitacre, President and CEO of J.R. Simplot Company</signatureName>
        <signatureDate>2010-12-08</signatureDate>
    </ownerSignature>
</ownershipDocument>
</XML>
</TEXT>
</DOCUMENT>
</SEC-DOCUMENT>
-----END PRIVACY-ENHANCED MESSAGE-----
