You can have an almost infinite colour range within a specific range of “lighter” colours with a Light Reflectance Value of more than 20%. (We will offer you colours from a standard palette, or advise you as the suitability of your own choice.)
Light Reflectance Value is a recognised industry measure relating to solar reflectance and heat gain and relates to the use of colours on EWI systems.
Coloured surfaces reflect light and heat (e.g. black clothes absorb heat in summer, white reflects). The lighter the colour, the higher the reflectance. The amount of light that is reflected from a surface is given as a percentage where white has a value of 100% and black a value of 0%. Dark surfaces reflect less light resulting in more absorption, the absorbed energy gets converted to heat.
On EWI systems the heat generated within the render has nowhere to dissipate resulting in more stress on the finished surface, so darker coloured renders with a light reflectance value of 20% or less will be more prone to surface cracking. This is made worse when a low LRV colour is used on larger areas.