A very simple method is to put the lux meter app on your phone. It will tell you the approximate reading. You can then look at it against the standard.

I am seeing more constructive conversations and actions coming from professional bodies like NZISM who have released their HSR program free for all. This is in conjunction with Worksafe but it appears NZISM have done all the work and it is found on their website.

Vanguard would definitely be my choice. For advice and equipment