Will Lightsheer Work on Blond/white Coarse Hair, Type 3 Skin, Also Fine Blond Hairs?

None of the laser hair removal systems will be effective in removing blond or white hair.  The hair needs to be dark to absorb the laser energy.  Electrolysis may be an option for you.

Lasers/light devices do not work well with light hairs, especially in darker skin tones. Electrolysis, which uses a small electrical current to destroy the hair follicle, is your best option. Since it is pigment blind, any color hair can be treated.

The way a laser works to remove hair is by heating up the hair to the point that the hair producing cells are damage to where they are unable to produce hair anymore.  The hair is heated up because the laser is attracted to the pigment.  In gray or blonde hair, there is no pigment, so the hair doesn't heat up, and the damage does not occur to the hair producing cells.  Even what is considered the best laser hair removal device, the LightSheer Duet, will not work on gray or blonde hair, nor will any laser on the market.  The only viable option is electrolysis for this type of hair, but that is painful and very tedious.

I would like to echo Dr. Baolgun's comments.  Without melanin (the pigment giving color to hair), then there will be no effect of any laser on the hair.  The only method to permanently remove blond/white hairs is electrolysis.  Even dyeing the hair will fail to produce an effect with laser hair removal.

The target for the laser in hair reduction is the pigment in the hair. The less pigment in the hair, the less effective the laser is at reducing hair growth. If your hair is gray/white, then the LightSheer or other lasers will not be helpful in reducing hair growth. If your hair is blond with some brown in it, you may find that laser treatments afford you enough reduction that you are satisfied, especially if the hair growth you are concerned about is on your face.