Brooks Short - Tampa, Florida , Aug 11, 2003; 11:04 a.m.
HMI's do produce some heat, not as much as tungsten but more than strobes. Balcar makes some very nice HMIs and has a pretty good selection of attachments and light modifiers.
But I'm curious as to why you would want to use HMIs rather than strobes ? You can simulate and augment daylight with strobes just as well as with HMIs, perhaps even more easily.
If it's shallow depth of field you're looking for, strobes that can be dialed down can help you achieve that. Whether you use HMIs or strobe you may need a ND filter as well for extremely shallow DOF.
HMI' also use a huge amount of electricity which might be something to consider.
Here's a sample food shot using strobes on a digital Pro Back. The goal was to produce a "morning" daylight look.