<PAGE>

                                                                   EXHIBIT 4.6

THIS WARRANT AND THE SHARES ISSUABLE HEREUNDER HAVE NOT BEEN REGISTERED UNDER
THE SECURITIES ACT OF 1933, AS AMENDED, AND MAY NOT BE SOLD, PLEDGED, OR
OTHERWISE TRANSFERRED WITHOUT AN EFFECTIVE REGISTRATION THEREOF UNDER SUCH ACT
OR PURSUANT TO RULE 144 OR AN OPINION OF COUNSEL REASONABLY SATISFACTORY TO THE
CORPORATION AND ITS COUNSEL, THAT SUCH REGISTRATION IS NOT REQUIRED.

                           WARRANT TO PURCHASE STOCK

Corporation: IGS Technologies, Inc.
Number of Shares: See Below
Class of Stock: See Below
Initial Exercise Price: See Below
Issue Date: July 8, 1999
Expiration Date: July 8, 2004

THIS WARRANT CERTIFIES THAT, for the agreed upon value of $1.25 and for other
good and valuable consideration, C. Y. Lee ("Holder") is entitled to purchase
the number of fully paid and nonassessable shares of Series H Preferred Stock
(the "Shares") of the corporation (the "Company") at the price per Share (the
"Warrant Price") all as set forth herein and as adjusted pursuant to Article 2
of this Warrant, subject to the provisions and upon the terms and conditions set
forth in this Warrant. The Warrant Price shall be equal to the price at which
the Company next sells its equity securities in an offering (the "Next Round")
in which the Company receives net proceeds of not less than One Million Dollars
($1,000,000), and the Shares shall be of the type sold in the Next Round. The
number of Shares that Holder may purchase under this Warrant is equal to $80,000
divided by the Warrant Price. Notwithstanding the foregoing, if the Next Round
does not occur by December 31, 1999 then, at the option of Holder, this Warrant
shall be for Series G Preferred Stock and the Warrant Price shall be equal to
the price at which the Company last sold its Series G Preferred Stock or $1.00
per share.

ARTICLE 1.  EXERCISE.
            --------

     1.1  Method of Exercise. Holder may exercise this Warrant by delivering a
          ------------------
duly executed Notice of Exercise in substantially the form attached as Appendix
1 to the principal office of the Company. Unless Holder is exercising the
conversion right set forth in Section 1.2, Holder shall also deliver to the
Company a check for the aggregate Warrant Price for the Shares being purchased.

     1.2  Conversion Right. In lieu of exercising this Warrant as specified in
          ----------------
Section 1.1, Holder may from time to time convert this Warrant, in whole or in
part, into a number of Shares determined by dividing (a) the aggregate fair
market value of the Shares or other securities otherwise issuable upon exercise
of this Warrant minus the aggregate Warrant Price of such Shares by (b) the fair
market value of one Share. The fair market value of the Shares shall be
determined at the time of such conversion pursuant Section 1.4.

     1.3  No Rights of Shareholder. This Warrant does not entitle Holder to any
          ------------------------
voting rights as a shareholder of the Company prior to the exercise hereof.

     1.4  Fair Market Value. If the Shares are traded in a public market, the
          -----------------
fair market value of the Shares shall be the closing price of the Shares (or the
closing price of the Company's stock into which the Shares are convertible)
reported for the business day immediately before Holder delivers its
<PAGE>

Notice of Exercise to the Company. If the Shares are not traded in a public
market, the Board of Directors of the Company shall determine fair market value
in its reasonable good faith judgment. The foregoing notwithstanding, if Holder
advises the Board of Directors in writing that Holder disagrees with such
determination, then the Company and Holder shall promptly agree upon a reputable
investment banking or public accounting firm to undertake such valuation. If the
valuation of such investment banking firm is greater than that determined by the
Board of Directors, then all fees and expenses of such investment banking firm
shall be paid by the Company. In all other circumstances, such fees and expenses
shall be paid by Holder.

     1.5  Delivery of Certificate and New Warrant. Promptly after Holder
          ---------------------------------------
exercises or converts this Warrant, the Company shall deliver to Holder
certificates for the Shares acquired and, if this Warrant has not been fully
exercised or converted and has not expired, a new Warrant representing the
Shares not so acquired.

     1.6  Replacement of Warrants.  On receipt of evidence reasonably
          -----------------------
satisfactory to the Company of the loss, theft, destruction or mutilation of
this Warrant and, in the case of loss, theft or destruction, on delivery of an
indemnity agreement reasonably satisfactory in form and amount to the Company
or, in the case of mutilation, or surrender and cancellation of this Warrant,
the Company at its expense shall execute and deliver, in lieu of this Warrant, a
new warrant of like tenor.

     1.7  Assumption on Sale, Merger, or Consolidation of the Company.
          -----------------------------------------------------------

          1.7.1  "Acquisition".  For the purpose of this Warrant, "Acquisition"
                  -----------
means any sale, transfer, or other disposition of all or substantially all of
the assets of the Company, or any reorganization, consolidation, or merger of
the Company where the holders of the Company's securities before the transaction
beneficially own less than 50% of the outstanding voting securities of the
surviving entity after the transaction.

          1.7.2   Assumption of Warrant. Upon the closing of any Acquisition the
                  ---------------------
successor entity shall assume the obligations of this Warrant, and this Warrant
shall be exercisable for the same securities, cash, and property as would be
payable for the Shares issuable upon exercise of the unexercised portion of this
Warrant as if such Shares were outstanding on the record date for the
Acquisition and subsequent closing. The Warrant Price shall be adjusted
accordingly.

ARTICLE 2.  ADJUSTMENTS TO THE SHARES.
            -------------------------

     2.1  Stock Dividends, Splits, Etc.  If the Company declares or pays a
          ----------------------------
dividend on its common stock payable in common stock, or other securities,
subdivides the outstanding common stock into a greater amount of common stock,
then upon exercise of this Warrant, for each Share acquired, Holder shall
receive, without additional cost to Holder, the total number and kind of
securities to which Holder would have been entitled had Holder owned the Shares
of record as of the date the dividend or subdivision occurred.

     2.2  Reclassification, Exchange or Substitution. Upon any reclassification,
          ------------------------------------------
exchange, substitution, or other event that results in a change of the number
and/or class of the securities issuable upon exercise or conversion of this
Warrant including without limitation, the conversion of the Company's
outstanding shares of preferred stock to common stock, Holder shall be entitled
to receive, upon exercise or conversion of this Warrant, the number and kind of
securities and property that Holder would have received for the Shares if this
Warrant had been exercised immediately before such

                                       2
<PAGE>

reclassification, exchange, substitution, or other event. The Company or its
successor shall promptly issue to Holder a new Warrant for such new securities
or other property. The new Warrant shall provide for adjustments which shall be
as nearly equivalent as may be practicable to the adjustments provided for in
this Article 2 including, without limitation, adjustments to the Warrant Price
and to the number of securities or property issuable upon exercise of the new
Warrant. The provisions of this Section 2.2 shall similarly apply to successive
reclassifications, exchanges, substitutions, or other events.

     2.3  Adjustments for Combinations, Etc. If the outstanding Shares are
          ---------------------------------
combined or consolidated, by reclassification or otherwise, into a lesser number
of shares, the Warrant Price shall be proportionately increased.

     2.4  Price Adjustment. If the Company issues additional common shares
          ----------------
(including shares of common stock ultimately issuable upon conversion of a
security convertible into common stock) after the date of the Warrant and the
consideration per additional common share is less than the price at which the
Shares are converted to common stock if the Shares are Preferred Stock, then
such conversion price shall be adjusted in accordance with the treatment of such
Preferred Stock under the Company's Articles of Incorporation in effect on the
Issue Date.

     2.5  No Impairment. The Company shall not, by amendment of its Articles
          -------------
of Incorporation or through a reorganization, transfer of assets, consolidation,
merger, dissolution, issue, or sale of securities or any other voluntary action,
avoid or seek to avoid the observance or performance of any of the terms to be
observed or performed under this Warrant by the Company, but shall at all times
in good faith assist in carrying out of all the provisions of this Article 2 and
in taking all such action as may be necessary or appropriate to protect Holder's
rights under this Article against impairment. If the Company takes any action
affecting the Shares or its common stock other than as described above that
adversely affects Holder's rights under this Warrant, the Warrant Price shall be
adjusted downward and the number of Shares issuable upon exercise of this
Warrant shall be adjusted upward in such a manner that the aggregate Warrant
Price of this Warrant is unchanged.

     2.6  Fractional Shares. No fractional Shares shall be issuable upon
          -----------------
exercise or conversion of the Warrant and the number of Shares to be issued
shall be rounded down to the nearest whole Share. If a fractional share interest
arises upon any exercise or conversion of the Warrant, the Company shall
eliminate such fractional share interest by paying Holder amount computed by
multiplying the fractional interest by the fair market value of a full Share.

     2.7  Certificate as to Adjustments. Upon each adjustment of the Warrant
          -----------------------------
Price, the Company at its expense shall promptly compute such adjustment, and
furnish Holder with a certificate of its Chief Financial Officer setting forth
such adjustment and the facts upon which such adjustment is based. The Company
shall, upon written request, furnish Holder a certificate setting forth the
Warrant Price in effect upon the date thereof and the series of adjustments
leading to such Warrant Price.

ARTICLE 3.  REPRESENTATION AND COVENANTS OF THE COMPANY

     3.1  Representations and Warranties. The Company hereby represents and
          ------------------------------
warrants to the Holder that all Shares which may be issued upon the exercise of
the purchase right represented by this Warrant, and all securities, if any,
issuable upon conversion of the Shares, shall, upon issuance, be duly
authorized, validly issued, fully paid and nonassessable, and free of any liens
and encumbrances except for restrictions on transfer provided for herein or
under applicable federal and state securities laws.  The

                                       3
<PAGE>

Company shall at all times reserve a sufficient number of shares of stock for
issuance upon Holder's exercise of its rights hereunder.

     3.2  Notice of Certain Events. If the Company proposes at any time (a) to
          ------------------------
declare any dividend or distribution upon its common stock, whether in cash,
property, stock, or other securities and whether or not a regular cash dividend;
(b) to offer for subscription pro rata to the holders of any class or series of
its stock any additional shares of stock of any class or series or other rights;
(c) to effect any reclassification or recapitalization of common stock; (d) to
merge or consolidate with or into any other corporation, or sell, lease,
license, or convey all or substantially all of its assets, or to liquidate,
dissolve or wind up; or (e) offer holders of registration rights the opportunity
to participate in an underwritten public offering of the company's securities
for cash, then, in connection with each such event, the Company shall give
Holder (1) at least 20 days prior written notice of the date on which a record
will be taken for such dividend, distribution, or subscription rights (and
specifying the date on which the holders of common stock will be entitled
thereto) or for determining rights to vote, if any, in respect of the matters
referred to in (c) and (d) above; (2) in the case of the matters referred to in
(c) and (d) above at least 20 days prior written notice of the date when the
same will take place (and specifying the date on which the holders of common
stock will be entitled to exchange their common stock for securities or other
property deliverable upon the occurrence of such event); and (3) in the case of
the matter referred to in (e) above, the same notice as is given to the holders
of such registration rights.

     3.3  Information Rights. So long as the Holder holds this Warrant and/or
          ------------------
any of the Shares, the Company shall deliver to the Holder (a) promptly after
mailing, copies of all notices or other written communications to the
shareholders of the Company, (b) within ninety (90) days after the end of each
fiscal year of the Company, the annual financial statements of the Company.

     3.4  Registration Under Securities Act of 1933, as amended. The Company
          -----------------------------------------------------
hereby grants to Holder the same piggyback registration rights granted to the
Holders of the Series H Preferred Stock.

ARTICLE 4.   MISCELLANEOUS>

     4.1  Term. This Warrant is exercisable, in whole or in part, at any time
          and from time to time on or before the Expiration Date set forth
          above.

     4.2  Legends. This Warrant and the Shares (and the securities issuable,
          directly or indirectly, upon conversion of the Shares, if any) shall
          be imprinted with a legend in substantially the following form:

     THIS SECURITY HAS NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF
     1933, AS AMENDED, AND MAY NOT BE SOLD, PLEDGED OR OTHERWISE
     TRANSFERRED WITHOUT AN EFFECTIVE REGISTRATION THEREOF UNDER SUCH
     ACT OR PURSUANT TO RULE 144 OR AN OPINION OF COUNSEL REASONABLY
     SATISFACTORY TO THE CORPORATION AND ITS COUNSEL THAT SUCH
     REGISTRATION IS NOT REQUIRED.

     4.3  Compliance with Securities Laws on Transfer. This Warrant and the
          -------------------------------------------
          Shares issuable upon exercise this Warrant (and the securities
          issuable, directly or indirectly, upon conversion of the Shares, if
          any) may not be transferred or assigned in whole or in part without
          compliance with applicable federal and state securities laws by the
          transferor and the transferee (including, without limitation, the
          delivery of investment representation

                                       4
<PAGE>

          letters and legal opinions reasonably satisfactory to the Company, as
          reasonably requested by the Company). The Company shall not require
          Holder to provide an opinion of counsel if the transfer is to an
          affiliate of Holder or if there is no material question as to the
          availability of current information as referenced in Rule 144(c),
          Holder represents that it has complied with Rule 144(d) and (e) in
          reasonable detail, the selling broker represents that it has complied
          with Rule 144(f), and the Company is provided with a copy of Holder's
          notice of proposed sale.

     4.4  Transfer Procedure. Subject to the provisions of Section 4.3, Holder
          ------------------
          may transfer all or part of this Warrant or the Shares issuable upon
          exercise of this Warrant (or the securities issuable, directly or
          indirectly, upon conversion of the Shares, if any) by giving the
          Company notice of the portion of the Warrant being transferred setting
          forth the name, address and taxpayer identification number of the
          transferee and surrendering this Warrant to the Company for reissuance
          to the transferee(s) (and Holder if applicable). Unless the Company is
          filing financial information with the SEC pursuant to the Securities
          Exchange Act of 1934, the Company shall have the right to refuse to
          transfer any portion of this Warrant to any person who directly
          competes with the Company.

     4.5  Notices. All notices and other communications from the Company to the
          -------
          Holder, or vice versa, shall be deemed delivered and effective when
          given personally or mailed by first-class registered or certified
          mail, postage prepaid, at such address as may have been furnished to
          the Company or the Holder, as the case may be, in writing by the
          Company or such holder from time to time.

     4.6  Waiver. This Warrant and any term hereof may be changed, waived,
          ------
          discharged or terminated only by an instrument in writing signed by
          the party against which enforcement of such change, waiver, discharge
          or termination is sought.

     4.7  Attorneys Fees. In the event of any dispute between the parties
          --------------
          concerning the terms and provisions of this Warrant, the party
          prevailing in such dispute shall be entitled to collect from the other
          party all costs incurred in such dispute, including reasonable
          attorneys' fees.

     4.8  Governing Law. This Warrant shall be governed by and construed in
          -------------
          accordance with the laws of the State of California, without giving
          effect to its principles regarding conflicts of law.


                              IGS TECHNOLOGIES, INC.



                              By:  /s/ Kenny Liu
                                 ---------------------------

                              Title:   CEO
                                    ------------------------

                                       5
<PAGE>

                                  APPENDIX 1

                              NOTICE OF EXERCISE
                              ------------------

     1.   The undersigned hereby elects to purchase __________ shares of the
Stock of ______________________________ pursuant to the terms of the attached
Warrant, and tenders herewith payment of the purchase price of such shares in
full.

     1.   The undersigned hereby elects to convert the attached Warrant into
Shares/cash [strike one] in the manner specified in the Warrant. This conversion
is exercised with respect to __________ of the Shares covered by the Warrant.

     [Strike paragraph that does not apply.]

     2.   Please issue a certificate or certificates representing said shares in
the name of the undersigned or in such other name as is specified below:

                         ______________________________
                                     (Name)

                         ______________________________
                         ______________________________
                                   (Address)

     3.   The undersigned represents it is acquiring the shares solely for its
own account and not as a nominee for any other party and not with a view toward
the resale or distribution thereof except in compliance with applicable
securities laws.

                              ______________________________
                              (Signature)

______________________________
(Date)

                                       6