Prosthechea radiata bloom may be dying...help!

[dlkc]

Hi,

I'm new to orchid growing and recently bought some flasks, but to encourage myself I bought a prosthechea radiata with buds so that I could have an orchid in bloom sooner.

I have placed this little plant in a home made humidity tray (picture attached) and I have tried to keep it evenly moist. It is in a well lit room with lots of windows but not near the windowsill.

Initially I was really excited about the lightening bud, it changed from green to a cream colour. But now, the tip of the bud has darkened to a light brownish colour. (See picture below).

Is this normal or do I have a black orchid thumb?!

If it is not normal, are there any tips so that the other 3 buds will bloom?

Thanks in advance!

Danielle