Gene's remarks about the awkwardness of having to climb out to the bow to shut off the lights has merit. With that in mind and depending on the size of your boat (and I think for the purposes of most of us less than 21ft or 7 meters is the case), you don't neccessarily have to position the lights right on the bow. The following is taken from the current edition of international collision avoidance regulations,
[font=Verdana, Arial, Helvetica]Rule 23[/font]
[font=Verdana, Arial, Helvetica]power driven Vessels Underway[/font]
[font=Verdana, Arial, Helvetica](a) A power driven vessel underway shall exhibit:[/font]
[font=Verdana, Arial, Helvetica](i) a masthead light forward;[/font]
[font=Verdana, Arial, Helvetica](ii) a second masthead light abaft of and higher than the forward one;[/font]
[font=Verdana, Arial, Helvetica]except that a vessel of less than 50 meters in length shall not be obliged to exhibit such a light but may do so; [/font]
[font=Verdana, Arial, Helvetica](iii) sidelights: and[/font]
[font=Verdana, Arial, Helvetica](iv) a sternlight.[/font]
[font=Verdana, Arial, Helvetica](b) An air-cushion vessel when operating in non-displacement mode shall, in addition to the lights prescribed in paragraph (a) of this Rule, exhibit an all-round flashing yellow light. [/font]
[font=Verdana, Arial, Helvetica](c)[/font]
[font=Verdana, Arial, Helvetica](i) A power driven vessel of less than 12 meters in length may in lieu of the lights prescribed in paragraph (a) of this Rule exhibit an all-round white light and sidelights.[/font]
[font=Verdana, Arial, Helvetica](ii) a power driven vessel of less than 7 meters in length whose maximum speed does not exceed 7 knots may in lieu of the lights prescribed in paragraph (a) of this Rule exhibit an all-round white light and shall, if practicable, also exhibit sidelights.[/font]
[font=Verdana, Arial, Helvetica](iii) the masthead light or all-round white light on a power driven vessel of less than 12 meters in length may be displaced from the fore and aft centerline of the vessel if centerline fitting is not practicable, provided the sidelights are combined in one lantern which shall be carried on the fore and aft centerline of the vessel or located as nearly as practicable in the same fore and aft line as the masthead light or all-round white light.[/font]
It's important to note that local harbour authorities may have specific rules for their particular area of authority, but as a general rule they will be very close. Long story short, in the case of smaller vessels, having a combination light such as the ones in my earlier post could easily be mounted on a pole and kept close to your cockpit area and mounted or stowed as required.
My 2 pennies worth
JAK