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TR-1: NOTIFICATION OF MAJOR INTERESTS IN SHARES

1. Identity of the issuer or the underlying issuer of existing shares to which voting rights are attached (ii):

Dialight plc

2. Reason for the notification:

An acquisition or disposal of voting rights

3. Full name of person(s) subject to the notification obligation:

Generation Investment Management LLP

4. Full name of shareholder(s) (if different from 3.):

5. Date of the transaction (and date on which the threshold is crossed or reached if different):

30 October 2015

6. Date on which issuer notified:

3 November 2015

7. Threshold(s) that is/are crossed or reached:

Above 19%

8. Notified details:

A: Voting rights attached to shares

B: Qualifying Financial Instruments

C: Financial Instruments with similar economic effect to Qualifying Financial Instruments

Total (A+B+C)

9. Chain of controlled undertakings through which the voting rights and/or the financial instruments are effectively held, if applicable:

10. Name of the proxy holder:

N/A

11. Number of voting rights proxy holder will cease to hold:

N/A

12. Date on which proxy holder will cease to hold voting rights:

N/A

13. Additional information:

Notification is based on using the total voting rights figure of 32,503,258 Source: (Bloomberg)

14. Contact name:

Generation Investment Management LLP – Alexander Marshall 020 7534 4700

Dialight plc – Nick Giles 01638 778641

Date: 4 November 2015