The halogen bulb version of our Impact XL provides superior light-output-to-weight ratio. With the same ruggedness and rubber overmold as the Impact XL, the halogen bulb provides a warmer light underwater. This light is great for backup, or as a primary daytime light, as the warm light is phenomenal for restoring lost colors on the reef. With a classic dive light look and feel, the twist-activated switch prevents accidental on/off.