No need for more power,
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This review is from: Smart 25 Lux Front with 1/2 Watt Rear Light Set with Battery (Sports)
Very small and very strong light, rear one is dazzling cyclist behind me so need to tilt it down a bit. Front is strong enough for daytime ride and "other road users friendly" at same time.
If you need some light for everyday work/home ride you don't need to go for anything more powerful, this small and cheap set will do all for you ;)
I use it with 3 other cheapest "no-name" (3.99GBP/2xAAA) LED rear lights which are less than half of power of this item. Just hang them all over my backpack and helmet to add extra flashing points on my back.