UVB Coverage Calculator

UVB lamp distance and replacement schedule.

Enclosure length (in)

Bulb type (0-3)

Ferguson zone (1-4)

Mesh screen (0-1)

Tab to move between fields

Optimal distance (in)

15.5

UVI at basking spot1.8

Coverage area (sq ft)2.02

Bulb length (in)24

Replace after (months)12

How to Use This Calculator

What each input means

Enclosure length (in): Interior length of the enclosure in inches.
Bulb type (0-3): 0 = T8 5.0, 1 = T5 HO 6%, 2 = T5 HO 12%, 3 = mercury vapor.
Ferguson zone (1-4): Species UV requirement. 1 = shade-dweller, 2 = partial sun, 3 = open sun, 4 = mid-day basker.
Mesh screen (0-1): 1 if UVB passes through a mesh screen lid (blocks ~35% UVB), 0 if mounted inside.

Optimal distance (in): Mount the bulb this far from the basking spot to achieve target UVI.
UVI at basking spot: UV Index the animal will receive at the basking spot.
Coverage area (sq ft): Approximate area receiving adequate UVB at the basking level.
Bulb length (in): Recommended linear bulb length (0 for mercury vapor spot bulbs).
Replace after (months): Months before UVB output drops below effective levels.

Identify Input Parameters
4 parameters
Enclosure length (in) = 36, Bulb type (0-3) = 1, Ferguson zone (1-4) = 3, Mesh screen (0-1) = 0 = 4 input(s) provided
Calculate Optimal distance
Optimal distance = 12 * sqrt(effectiveUVI / target)
15.5 = 15.5
Calculate UVI at basking spot
UVI at basking spot
1.8 = 1.8
Calculate Coverage area
Coverage area = coverageAreaSqIn / 144
2.02 = 2.02