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This is strange for sure. Ran some comparative tests last night against the LX1330B I've used for throw over the last 3 years or so. There's a pattern that the LT45 is higher at lower temps (progressively), and roughly the same at about 6500K,then Neal's LEP it reads low at about 10%. Also about 10% low on an ugly beam XHP50.2 3V 6500K in a SMO 50 mm head diam light (C818) - the beam has some blue in the center of the hotspot. I was using the L0 level for all these tests.

I'm assuming the LT45 is more accurate across temps, but wondering what you think.

Ohh - with Neal's LEP on a Shockli 5500, my tail amps reading is only 2.35V. It's been in that range of ~2.3V-2.4V across different cells, and I have both springs bypassed. I think it's much lower than the other Neal's LEPs out there. People have been posting amps in the 3.0V range. This could explain why my throw #'s are lower: 937.5 kcd on the LX1330B, 859 kcd on the LT45, both taken at 5 meters. Since I bought the LEP more recently, could be they reduced the amps (resistor change probably), or I just got an under performing LEP. I'm seriously considering if it's possible to use a driver replacement to get 3 amps.