There are clear themes for the light domain.
Cleric light domain.
There are some great thematic options.
For example the portfolio of the greek god apollo includes the domains of knowledge life and light.
I ve played an aasimar light domain cleric to 17th level and this is a great article.
With potent spellcasting at level 8 their cantrips also pack a punch.
A fantastic set of offensive spells which close the gap between clerics and wizards.
Go in depth with our light cleric 5e guide.
Heat in battle and illumination when it is needed are common threads in the available spells.
I would also say it s extremely useful to go through the monster manual and make a complete list of all creatures affected by sunlight in various ways to help the dm remember of course perhaps a little meta gamey but you re a light domain cleric i.
All the domains over which a deity has influence are called the deity s portfolio.
They get some strong domain spells both with damage and information gathering.
As an additional option included in the player s handbook the light domain is one of the stronger domain choices for damage dealing clerics this type of cleric domain has the radiance of the gods at their back and are paragons of renewal.
Light is the blaster cleric domain.
Their abilities seem like great support skills and they use wisdom.
You get a lot of higher damaging spells ex fireball wis to cantrips and a good damaging channel divinity.
Because of the domain proficiencies cleric is the only class that can get you heavy armor proficiency at level one as a secondary class.
Most of the spells and channel divinity actions a light cleric takes uses light and fire much in the same way that their deity uses the sun.
So you will want to be fighting at range mostly using your cantrips.
Even before domain features multiclassing to cleric as a secondary class affords light armor medium armor and shield proficiencies.
Some of these gods are portrayed as the sun itself or as a charioteer who guides the sun across.
As a cleric you choose one aspect of your deity s portfolio to emphasize and you are granted powers related to that domain.
Gods of light including helm lathander pholtus branchala the silver flame belenus apollo and re horakhty promote the ideals of rebirth and renewal truth vigilance and beauty often using the symbol of the sun.
The offensive powers of a light cleric are legit with six different fire related spells to choose from.