MELCON LED Fixture Thermal Calculator

*Ra - Refer LED Manufacturers Catalog
*Rb - Temp.Coeficient between component to MCPCB
*Rh - Refer Heat sink Manufacturers
Catalog ( Defined according to:Grade+Area+Weight )
*Tj defines deterioration factor for life of LED in hours.


*where '0' is infinite Heatsink.
Ambient Temperature = Ta
°C
Led / Array Power Dissipation = Pd
W
Led / Array Thermal Res = Ra
°C/W
Transfer Material Thermal Res = Rb
°C/W
Heatsink / Thermal Res = Rh
°C/W


Ambient Temperature = Ta
°C
Calculations are based on the formula Tj = Ta + Pd (Rh + Rb + Ra)