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20W halogen derated to 10W (so it's very yellow, and not very efficient). At 20W it blew out the photo to the point where I didn't think it was a useful comparison. Note that the difference in battery size between supplying 50mA and 2A is significant (300g vs 2.5kg, with the 2.5kg battery only good for 2-3 hours rather than 40 hours from the 300g pack).

20W halogen derated to 10W (so it's very yellow, and not very efficient). At 20W it blew out the photo to the point where I didn't think it was a useful comparison. Note that the difference in battery size between supplying 50mA and 2A is significant (300g vs 2.5kg, with the 2.5kg battery only good for 2-3 hours rather than 40 hours from the 300g pack).