Share Buy-Back

THIS ANNOUNCEMENT CONTAINS INSIDE INFORMATION FOR THE PURPOSES OF ARTICLE 7 OF THE MARKET ABUSE REGULATION (EU) NO. 596/2014.

FOR IMMEDIATE RELEASE

10 May 2019

Spectra Systems Corporation

("Spectra" or the "Company")

Share Buy-Back

The board of Spectra announces that on 10 May 2019 WH Ireland Limited purchased for cancellation 1,000 of Spectra's common shares at a price of 130 pence per share. This purchase was made in accordance with the Company's Byelaws and with a board authority dated 8 April 2019 for up to 4,500,000 of the Company's shares to be bought back.

As at the date hereof, a total of 1,000 common shares have been purchased and cancelled under this authority at a total cost of £1,300 or an average price of 130 pence per share.

The Company advises that, following this purchase and cancellation, the Company's issued share capital now comprises 45,870,297 common shares as follows:

614,537 shares in the Regulation S stock line ISIN number USU8457D1091 (AIM: SPSC); and

45,255,760 shares in the unrestricted line ISIN number US84756T1060 (AIM: SPSY).

The total number of shares with voting rights is now 45,870,297. This figure represents the total voting rights in the Company and may be used by shareholders as the denominator for the calculations by which they can determine if they are required to notify their interest in, or a change to their interest in, the Company from the date of this announcement.

Enquiries:

Spectra Systems Corporation

Dr. Nabil Lawandy, Chief Executive Officer Tel: +1 (0) 401 274 4700

WH Ireland Limited

Chris Fielding (Managing Director, Corporate Finance) Tel: +44 (0) 20 7220 1650