To make Light Crystal Crisp increases the temperature further and the endosperm darkens and flavours develop further. The crystallised sugars present impart an intense caramel flavour and reddish hue to the beer which works well in Bitters and Ruby beers.
The number after the word Crystal refers to the EBC colour of the malt if you mashed at 100% of the grain bill. To get a rough conversion to Lovibond, just divide by two.