4ft Conventional Tub light - V/S - 10w LED Bulb

Emperor said:

sorry for hijacking the thread ...

if I replace 4ft Conventional Tub light (6500k Lumens) with 10w LED Bulb (6500K Lumens), will the LED BULB light cover same area as covered by Conventional 4ft Tube Light?

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No. Tube light has much better coverage even at the same wattage. In your case, you reduced the wattage by at least half assuming that you replaced a 40 W fluorescent tube light with 10 W LED.

6500K is the colour temperature, what they call cool white. 2700K is the other end, warm (yellow) white.

10W LED bulb would be around 1,000 lumens.
4 ft conventional fluorescent tube is around ~2,000 lumens.

That said, even if you do get a matching 20W / 2,000 lumen LED bulb, in my experience a longer 4 ft LED tube is better at spreading light.

The 4ft LED batten is less stress full on the eyes if it comes in your vision, compared to a same wattage bulb.

Dont replace it with bulb, replace it with equivalent lumens led batten with good quality LED which cause less stress on eye.