How Much Would It Cost to Change Light Guides? We Have the Unlimited Solution! Bleach Infiniter supplied pre-installed in a plastic guide. It's a ready-to-use solution. No installation is needed. *WARNING: an unlimited light guide is not compatible with old devices: v. 1.3 and 1.8. Please make sure the version of your device is different, for example, C2.3 L2.5, C0.8 L0.8, etc. To see the firmware version, just launch a device and wait for 5-7 seconds until the numbers and letters appear on the screen. Please feel free to contact us if you need any assistance.