It's the same amount of heat just dispersed differently(leds use heat sinks , hps emits heat from bulb) , HPS have a high bump of IR light which makes surface temps higher , if your thermometer is directly in the light the readings will be off unless you got an IR/UV protected sensor. It's the first law of thermodynamics, it's not something i am making up or can change. If you don't believe me just google it, or google watts to btu conversion , lots of education out there on the net.
And i don't hate anything i am using all different types of equipment as well and let the results speak for themselves , i am currently testing 315 CMH's in different reflectors and the different bulbs in my setup , but i got leds too.