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.