Terms of use

Last updated 16 October 2026.

Information only

The guides, tables and calculators are general information. They are not engineering design, legal advice or a quotation. Prices and lead times are indicative and can change.

Verify before you build

Structural, electrical and photometric designs should be checked by a qualified professional against the standards and rules that apply to your project.

Quotations

A quotation is binding only when it is issued in writing with a date, validity and specification.

Content

You may link to our pages. Please do not copy guides or tables in bulk without permission.

Liability

To the extent permitted by law, we are not liable for losses resulting from reliance on the general information on this site.