I don't know of any that will allow you to use the standard holster.  I use the Streamlight TLR-1.  It ranges from $90-125 depending on where you buy.  It is a very bright LED and works very well.

Blackhawk also makes one of it's Omega holsters for the gun/light combo. It's not molded, so it's pretty universal.

Lexpddj says ...

Anyone tell me if there is a good quality light that can be used on a glock handgun that will still use the standard holster.  I'm have to provide information to my highers why it would be a great tool to be available for a backup light source for me and my fellow K9 officers.  Multiple times have we come across a suspect during a search or track, but have a dog in one hand and have to make the choice between flashlight and handgun for the other.  Trying to have a second option available, not the main search source, just as a second option if needed.  If you have information or studies that can help me in convincing the highers that we should have this option available, please help.  thanks

the only way you can use the standard holster is to carry the tac light in a pouch on your belt.  I tried that off duty as an experiment with the glock light and it turns out to be a logistical nightmare. you need both hands to put the light on the gun after drawing it and it was not a speedy process and i don't think it would ever be fast, even with lots of practice.  Far easier, and what I did was get a holster that allows the tac light to remain on the gun like the one pictured in pete114's post.  I went to a safariland holster also. 

well thanks for the imput guys.  I am trying to write a proposal to our department to allow our K9 officers to carry a light on our sidearm as an alternative light source, if we were to come across a suspect while tracking or searching.  Usually we end up with either a flashlight and dog, or gun and dog.....we think we really need the option on the weapon mounted light, but our staff feels it is more of a liability due to people wanting to search with the light on their weapon and pointing their gun at people....I would like to get some imput from both the pro's and con's, and your department has a policy on carrying weapon mounted lights.    I think this will be some labor intensive research to fnd what is needed to get it approved.  If there is anyone out here that can give me some insight, and wouldn't mind sending me a copy of their department policy, what type of light you use, and holster used.  Please I need the good and the bad if you have it...any help is greatly apprecicated.  Trying to make it safer for our officers and K9's. 

Thanks

Darrell Jones

Lexpddj says ...

Anyone tell me if there is a good quality light that can be used on a glock handgun that will still use the standard holster.  I'm have to provide information to my highers why it would be a great tool to be available for a backup light source for me and my fellow K9 officers.  Multiple times have we come across a suspect during a search or track, but have a dog in one hand and have to make the choice between flashlight and handgun for the other.  Trying to have a second option available, not the main search source, just as a second option if needed.  If you have information or studies that can help me in convincing the highers that we should have this option available, please help.  thanks

I have a TLR1 on my Glock with a Safariland holster.  I carry a XD 45 tactical off duty with a TLR2S and I have never had a problem with either.