I read somewhere (I'm trying to relocate the web page right now) that the "Cool Blue" lights don't emit as much light as a regular halogen bulb. Here's the theory, and it makes a lot of sense to me: They are simply a high quality halogen bulb, coated with some substance to absorb some of the light coming out in order to generate the "cool blue" color. They burn at the same temperature as a regular 9004 (or whatever size), have the same wattage, draw the same current, are the same basic core - with the addition of the coating and generate the same number of lumens. Now, if this is all true, then coating the glass with a substance to absorb some part of the light spectrum so that the rest appears bluish means, to me, at least, that there is LESS light getting to the road. I was ready to run out and buy some of these until I started thinking about it and then did the research.
I'm probably going to go with a pair of the PIAA Platinums because at least they claim to have put more stuff in their bulbs to generate more light. Unlimately, I'm planning on adding some PIAA Pro 90s, but in the meantime, maybe Santa will leave a pair of the Platinums in my stocking.
If I can find that comparison link, I'll come back and post it.
OK, I found the link I was looking for. Plus a couple of others:
http://lighting. mbz.org/tech/info/ - great discussion of most lighting questions I've come across. I'm not sure of the source/authority of these posts, but they appear to me to be factual and straightforward.
http://www.autosupermart.com/shopcart/solaris.html - here's an option to the PIAA Platinum bulbs. These are for "off road or show use only" though.
http://www.autobulbdepot.com/bulbs_piaa. tpl?cart=302594315227112 - some info on the PIAA Platinum bulbs, which are DOT compliant.
http://www.sylvania.com/prodinfo/auto/cool/welcome.htm - The "Cool Blue" homepage. Interesting to note that their lights generate exactly the same number of lumens as standard 9004s! Read the effects of only allowing the blue spectrum (Blue Bulbs section of the first link) to be emitted.
Damn, now I've confused myself again and I don't know which ones to get! Definately not the Cool Blues, but either the Solaris or Platinmus. Sigh. Too much information!!!
[This message has been edited by joel (edited 11-20-1999). ]