Holding(s) in Company

Dialight PLC
21 August 2007


                                                                   
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:

DIALIGHT PLC


2. Reason for the notification (please state Yes/No): (   )

An acquisition or disposal of voting rights:                               (YES)

An acquisition or disposal of financial instruments which may result 
in the acquisition of shares already issued to which voting rights are 
attached:                                                                  (NO)

An event changing the breakdown of voting rights:                          (NO)

Other (please specify) :                                                   (NO)


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

IMPAX ENVIRONMENTAL MARKETS PLC
 

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

NORTRUST NOMINEES LIMITED
 

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

15 JUNE 2007
 

6. Date on which issuer notified:

20 AUGUST 2007
 

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

3%
 

8. Notified details:


 


A: Voting rights attached to shares

 
Class/type of shares            Situation previous to  
if possible using the           the Triggering         
ISIN CODE                       transaction        
                       Number of shares       Number of voting Rights 

ORDINARY SHARES        930,447                930,447
 

                     Resulting situation after the triggering transaction 
 
Class/type of shares Number of shares  Number of voting rights    % of voting rights  
if possible using                                                                 
the ISIN CODE                                                                         
                     Direct            Direct     Indirect        Direct    Indirect  

ORDINARY SHARES      1,015,447         1,015,447  NIL             3.25%
 

B: Financial Instruments

Resulting situation after the triggering transaction 

Type of     Expiration Date  Exercise/Conversion Number of voting     % of voting     
financial                    Period/ Date        rights that may be   rights          
instrument                                       acquired if the                      
                                                 instrument is                        
                                                 exercised/                           
                                                 converted.                           

NIL
 


Total (A+B)
Number of voting rights       % of voting rights 

1,015,447                     3.25%
 

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

N/A
 

Proxy Voting:

 
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:

IMPAX ASSET MANAGEMENT LIMITED IS INVESTMENT MANAGER TO IMPAX
ENVIRONMENTAL MARKETS PLC.
 

14. Contact name:

CATHRYN BUCKLEY
 

15. Contact telephone number:

01480 447490






                      This information is provided by RNS
            The company news service from the London Stock Exchange