18. GRE considered ECE/TRANS/WP.29/GRE/2011/37 by the expert from GTB removing the materials for lenses and coating in the definition of types. GRE agreed in principle with this proposal but noted that other lighting Regulations should also be amended. GRE invited the experts from GTB to prepare a collective amendment to all the Regulations concerned, for consideration at its March 2012 session.