Do you know what the unit k is?
K is for kelvins. Colour temperature.
When you say "I want more", I assume you're looking for brightness.
Brightness is measured in lumens.
It's crazy how many people mix the two up, so you're not the only one.
RULE: The higher the kelvins, the less lumens.
Anything above 6000k will reduce visability noticeably.
That being said, you want 30000k?
That will give you a PINK/MAGENTA colour. Imagine the visability with those.
Might as well not even have your headlights on.
The best output is 4300k.
There are only two bulbs that are really considered an upgrade to the stock 4300k which is made by Philips (85122+) and Osram (CBIs).
The Osrams cost like 200 a pair so they are expensive but give THE BEST output.
Oh and to answer your question, no 30000k will not melt your headlight lens, given you used the right bulb.