What phone has the strongest/best flash?

I just want to know what phone it is, not anything about bright lights can hurt your eyes etc. I do caving, and I can only carry a mobile phone around me for emergencies, as i do extreme caving, which means I go just in some thin clothes, no other equipment, and just a phone, so if I want to take a picture of the inside of a cave, so I can see what is ahead of me, I need the strongest flash, don't care really too much abut the quality of the camera...