This is my 1st bonsai. I got it 3weeks ago and the leaves are continously turning yellow and then dark drown(like it's burn).
Recently I changed the soil from Clay to a fukien specific draining soil. Also due to limited light I am use a UV lamp for 10hrs a day. Please help

naba09 wrote: This is my 1st bonsai. I got it 3weeks ago and the leaves are continously turning yellow and then dark drown(like it's burn).

Hello. It is dying.

naba09 wrote: Recently I changed the soil from Clay to a fukien specific draining soil.

Sorry, there is no such a thing as a "Fukien specific soil".
There is bonsai soil, free draining and aerated.

naba09 wrote: Also due to limited light I am use a UV lamp for 10hrs a day.

Naba, a picture or two would help a lot.
Your Fukien should be outside. Trees belong outdoors. An UV lamp will not be sufficient for the tree needs.
Please take a look:
www.bonsaiempire.com/tree-species/carmona

Here are the pictures

naba09 wrote: Here are the pictures

Naba, try here:
www.bonsaiempire.com/forum/general/13371...-a-picture-beginners

Trying to upload the pic again.

That's not so bad after all and the soil looks ok.
Old leaves turn yellow, brown and die in a natural process.
Let it rest and water correctly.