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Investigations are connected with design and application of thermally and cost effective rigid LED strips. Standard FR 4 PCB is used for making rigid strip and LEDs are soldered on it. Special copper pins soldered underneath LEDs contribute to low thermal resistance between LEDs and heat sink - like when MCPCBs are used. Application of this type low cost rigid LED strips allows decreasing operations (and expenses) connected with assembling of LEDs onto a heat sink several times. A lamp for interior lighting is designed on the base of this type LED strips. Thermal management calculations are made and proper heat sink is chosen. Thermal loading of LEDs is experimentally tested at various ambient conditions (air temperatures from 20°C to 45°C) and different current values through LEDs - up to 600 mA. Infrared thermography is used for evaluation of temperature distribution on LEDs and heat sink. Thermal management investigations show very good qualities of developed LED strips.