HEINE LED 2,5V HQ Module for BETA RetinoscopeThe new HEINE LEDHQ module shines for eternity. If you consider the ordering costs, the shipping costs and the costs of changing the bulb itself, the upgrade pays for itself after around 3 XHL bulb purchases. Since the LEDHQ module consumes less power, the single use battery or the battery charge lasts longer, and the rechargeable batteries durability is also increased since charging is required less often. Its good for the environment, since theres