In any event 10 meters is to far for any light (10 meters = aprox 30 feet). If your talking an HID light (bright yellow with ballast) then from what I have read your using wrong light to begin with. The HID light isnt used till they get bigger, should use either CFL bulb or flouresant tubes when first starting. Look for either a cool white or daylight bulb as either of these is high on the blue spectrum side of lighting which is what you want to start/veg growth. Stay away from the "plant bulbs" as these are high on the red spectrum side of light and those are used for flowering. when you get the right bulbs put your lil babies right under it and they should slow down on the stretch quite a bit. repotting and support sticks can help also. Have a nice day!!