Here are some other words that are related to light in Sanskrit:
* प्रकाशः (prakāśaḥ) - light, illumination
* दीप्तिः (dīptiḥ) - radiance, brilliance
* तेजः (tejaḥ) - splendor, brilliance
* रश्मिः (raśmiḥ) - ray of light
* आलोकः (ālokaḥ) - light, illumination
The specific word you choose to use will depend on the context.