Grow Light Question - which bulb is hotter HPS or dual spectrum HPS?

I was wondering. It's getting hot, and even though I am using a prima klima cooltube, 2 inline, 1 exhaust, 1 intake and an inside vent, temps are still getting pretty high - around 90F / 32C.
I have some bulbs - Sonlight Agro 600W HPS (yellow box), Philips Son T PIA Plus 600W HPS and a SunMaster Dual Spectrum.

My question is - which one gets hotter. It would take me no longer than 15 - 20 minutes to change it. Also - does dual spectrum have better effect on the plants during flowering?

bump

By the way 32C is at the top of the plants. At the bottom is ~24.

whats the ambient temperature and where are you venting too? If the intake temp is high then that would sort of explain the higher temps

Intake is 20 - 25C. Right now it's cold and it's still the same. I am beggining to think that the thermometer might be defective.

OK. I know now for a fact, that the Sunmaster works colder. I replaced the Philips with a Dual Spectrum 600W Sunmaster and temp dropped to 28C at the top of the plants for 20hrs/day cycle.