About Diamond 4 SAD Replacement Lamp Accessory
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www.peak-nutrition.co.uk / health_wellbeing / seasonal_affective_disorder / diamond_4_sad_replacement_lamp_accessory.htm
Hi, it will last more than 3 years even at that usage. However, we recommend you replace every 3 years at least as the effectiveness of the bulb will start to diminish after 3 years. Kind regards