Holding(s) in Company

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:

Aberforth Partners LLP

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

Shareholder Shares

1. Aberforth Smaller Companies Trust plc 2,473,618

2. Aberforth UK Small Companies Fund 818,800

3. Aberforth Geared Capital & Income Trust plc 487,845

All shares are registered in the name of Nortrust Nominees Ltd A/c Aberforth

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

21 October 2010

6. Date on which issuer notified:

22 October 2010

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

12%

8. Notified details:

A: Voting rights attached to shares

B: 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:

Held by Aberforth Partners LLP

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:

14. Contact name:

Aberforth - Pauline Robson, Aberforth Partners LLP 0131 220 0733

Dialight plc - Nick Giles 01638 778641

Date: 22nd October 2010