This Robus LED replacement for 4x18W T8 lay-in modular fits into standard sizes of ceiling grid - 15mm and 24mm and has a wide operating ambient temperature range of -20 degrees to 40 degrees. Suited for use in offices shops reception areas restaurants hotels schools hospitals with low glare rating of 22 and TP(b) rated diffuser in accordance with BS2782.02011 Method 508A. The 50000 hour average lamp life is up to 5 times that of a standard fluorescent lamp. Very high efficacy of 104lm/W. Suitable for switching by PIR Microwave or Photocell