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Yes. Modern shimano hubs are only rated at 1.5 W these days. 2.4W are absoultely fine. Dep on the light the flickering that some show at low speed may happen at a faintly higher speed, but we're talking 3mph instead of 2mph.
Basically the 2.4W rating is something to do with German regs, basically they're likely to be nearer 3W but that can't be assured, or something.
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Yes, 2.4w will be fine for modern led lights (even if you add a rear) but not so great if you’re wanted to add additional load eg for battery charging.
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I think the 2.4W standard for front light only/3W for front and rear related to using incandescent bulbs (of which halogen achieves much better brightness). LEDs are much more efficient, although I wonder to what extent modern lights are still developed with a 2.4-3w standard in mind?
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2.4 was good for a strong B&M light, which would also give light on very steep and slow stuff. One thing though, I find shimano hubs quite notchy. I thought my cheap 2.4W one was to blame, but an Alfine I recently installed feels just as rough.
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Skülly
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@trigs
Hopefully a simple question... will a 2.4 W dynamo hub sufficiently power a front light?
Specifically, I'm looking at pairing this cheapy Shimano hub (https://www.ebay.co.uk/itm/392281228871) with a B&M IQ-XS. No intention to run a rear light as I only feel comfortable using blinking rear lights (except in group rides).
Motivation is an approx £80 hub+light setup vs the £300 or so SON I'd planned. £220 would be nice not to spend. Google has led to some real rabbit holes so any help would be grand.