'just talked to a SAATI rep and they confirmed what I have been saying for years, Vastex unit seems to have the most consistent light field on the market. Also, knowing the wavelength of the LEDs in it, they are right on the money there, too. Problem with all the multi bulb units is that they still have some light scatter and limit the ability to hold the super fine dots. (anybody holding a 3% 55lpi probably does not have linearized output. Most 3% dots I see are closer to 8-9%.) SAATI's 450W light unit is, to the best of my knowledge, the only LED light that will hold the superfine detail. So, if the very small dots are important to you, stay away from multibulb designs. My comments on the Vastex unit always said that they are good for 99% of the printers out there. Those absolutely requiring the MH precision should stick with MH or check out the SAATI 450W.
I know both Alan and Rockers, had or are having issues with their Vastex units, not sure what is causing this, but certainly we did not have the problems they had.
pierre