For airgun ranges the nightfox IR torches are good and not to expensive, they have a dimmer switch and a little light to tell you if they are on or off .
Another vote for Nightfox, but you may need a laser illuminator if it's anything like the Alpex lite. Blackwood outdoors do a reasonably priced laser 940nm which I use on my Alpex lite, the led wasn't quite enough.
LED Color(optional):White,RED,Green,IR 850nm,ir 940nm. 38mm Zoomable Lens. For IR 850,IR 940nm,To Be Used with Night Vision Device (Infrared Light Is Invisible to Human Eyes). one flashlight own two colors,and more.
www.ebay.co.uk
It may be purchased as a basic torch or as part of a larger kit, including rat tails, battery and charger, mounts etc.
The torch has a low, medium and high power output and the beam is focusable. I use my 940nm version clipped to my scope when using my Pard 007a for ratting, as it spooks the prey less that the Pard's on-board 850nm lamp. The medium power setting is more than adequate out to 25 yards and more.