Ive had my Solarflare 200w Fullcycle in use for a little over a week now. Im currently on 12 hours on/12 hours off with the aid of a digital timer. My question is this

Why does my light stay on when the timers set for off? The solarflare still gives off a bit of light, I can see my hand about 2 inches away from the light in room I worked hard to lightproof. Is this normal? is it broken? Do I have to send it it in for fixing?
Any help would be appreciated.