If or when you are thinking of buying a new lamp for your desk, buy one that doesn´t make you disappointed like Louis Paulsen "NJP". It gives a soft lubricant but efficiant light and you can keep it forever and ever. It is a true investment that keeps you happy more than a couple of weeks (not like the lamps from the big warehouse).
And no I wasn´t paid to write this :-). I am just tired of seeing people overconsuming cheap (non environmentally friendly) lights in our darkest time of year. Be smart make an investment instead!