Whelen 500 Series: LIN4 vs. LIN6 vs. LIN8?

For those knowledgable on the various styles of LED 500 Series lightheads that Whelen produces:

In there any significant difference between the economy LIN4 and the standard LIN6? I've also seen there are LIN8 versions from ballasted Liberty bars (whatever that means), are those signicantly brighter than a LIN6?

For context, I'm thinking of eventually getting an old Whelen TA836, selling all the halogen 500's, lens, harness, everything but the frame. Then I was going to cut the frame to produce something similar to 2 dashmisers, and 2 pieces about 1.5 times longer than a single dashmiser to each accomodate a 500 and an MR11 takedown.

Then I'd try and run all of that off of 2 ULF28's.
 
Go with LIN6, with the most recent manufacturing dates you can find. There is a noticeable difference in brightness between LIN6 and LIN4. I feel there somewhat of a brightness difference between newer LIN6 and older LIN6, especially in amber. Avoid LIN8, regardless of how inexpensively you can find them, as you will be unable to fit a ballast inside of the TA836 housing.
 
Go with LIN6, with the most recent manufacturing dates you can find. There is a noticeable difference in brightness between LIN6 and LIN4. I feel there somewhat of a brightness difference between newer LIN6 and older LIN6, especially in amber. Avoid LIN8, regardless of how inexpensively you can find them, as you will be unable to fit a ballast inside of the TA836 housing.
Thank you for all the info. I'll have to save a little more for LIN6's, but if they are notably brighter, it seems like it'd be well worth it.
 

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