Question: "How does the lumens (amount of light) compare to the old style 20 year old 4ft twin fluorescent lights?"

Answer: One four foot fluro tube typically put out 50-100 lumens per watt when new. So a four foot 36W tube could start life at up to 3,600 lumens.

But they decline in brightness as they age and put out light 360 degrees around the tube, so unless a reflector is behind them, all light isn't being directed where needed. By comparison, our LED battens tend to have a 140-degree beam angle (or similar).

If you're replacing a twin-tube fitting, we'd suggest considering two slimline (20W) battens or one 40W indoor batten from Philips.

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