Posted By D Adam We have some old offices which have fluorescent lighting with prismatic diffusers. Do these have to be changed out for Cat 2 diffusers. These offices are primarily used by VDU users. If they have to be changed - could you tell me what legislation - states this?

Posted By Nick House Just to throw a spanner in the works, we have a mixture of CAT1 & CAT2 lighting in our offices, and although CAT2 was allegedly designed to cut down on glare etc. for DSE users, I was amazed at how many people still preferred the old style CAT1 lighting, as they said that CAT2 gave off a harsher light. As far as I am aware, both Linear and recessed prismatic lighting are still acceptable in offices, providing that they do not cause any undue glare to DSE users. When carrying out a risk assessment on the office environment, MHSW Regs 1992 state that employers must assess possible risks in the workplace. This also covers lighting. Therefore, I would suggest that you also consult with DSE users to see whether they have any undue problems with the lighting that is currently in place before making any decisions on changing the light units/ diffusers - if it ain't broke, don't fix it. Finally, another thing to consider is the colour of the walls etc., as this can have a significant bearing on the amount of glare from both natural (primary) light and artificial (secondary) light. What would have the greater efect, changing the lighting, or painting the walls/ ceiling a pastel colour which may absorb some of the glare? Some of the worst offices that I have come across are ones where the walls are painted white, or a very pale yellow. Regards, Nick.