upgrading MITRA 6100hv to 6200hv

[sphelps]

Might be worth while once you have some decent millage on your fixture but before then I find it hard to justify the cost especially if the price you got was cost and you have more than one fixture to upgrade. While I agree upgrading current fixtures may be better than buying complete new fixtures, in the case of 6100 vs 6200 I just don't see much difference. You mentioned having spares as an advantage but they aren't compatible so really worthless to yourself or anyone with a 6200. Perhaps they have some value on the used market though (for those with 6100), although tough sell as I'm sure the current user base including myself isn't expecting premature failures from the GHL brand and would probably rather upgrade down the line rather than replacing existing.

Is the 6100 no longer available?