u/Inevitable-Net-191

What's causing the browning? I water when the soil looks dry (typically 3-4 days). I live in the tropics so humidity is >60% and temps are around 28-33. I put it under a grow light, at the edge of illumination, where the brightness varies from approx 250 ppfd in down to around 50ppfd, 12hrs a day. Previously it was closer to 300ppfd all round.

Previously I put it in a dark corner and overwatered it, so it lost most of its original leaves and flowers. But I've brought it out and bought a grow light.

So what's wrong? Too bright? Soil stays damp for too long? I bought some chunky mix for aroids but haven't gotten down to replanting as I'm afraid it would start dying again.