No. Never touch the glass with bare fingers. Skin oils create 'hot spots' that cause the bulb to shatter when heated. Always use a clean cloth or gloves.
Yes, these tubes are fully dimmable using standard TRIAC dimmers or professional studio dimming packs without changing the flicker frequency.
Yes, the 118mm 1000W R7s halogen tube is the standard replacement bulb for most professional 1000W Redhead and open-face studio lights.