resistore offer heating

Hi everyone I have a problem with overheating resistors.

So basically it's a 24volt vehicle that had normal globes as rear lights I have replaced them with led lights the reason I put resisters is because the light module is picking up that there is no globes present and shows faults. The value of the globes was 21watts so according to my calculations to get about the same value a I went with 27ohm 50watt resistors on 24volt that should give me 0.8amps and 21.3 watts. But it the resistors got so hot they melted the box.

The resistors are aluminium cased. My Question is are my calculations wrong or what would you suggest is my issue here

Thank you in advance

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